V6 4.0 which fuel to use, what to avoid? Fuel Economy

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Re: V6 4.0 which fuel to use, what to avoid?

Postby Gipsy on Wed, 01 Jun 2022 6:51 +0000

Probably true, stick to 95/LPG
Cheers Gipsy :D although I'm sure somebody will challenge that :lol: even Einstein wasn't certain of his theories.
My 2013 auto D4D DC SR5, prefilter, 3" exhaust and Chip with egt probe, stock SR5 rims with Toyo Open Country AT2 265/65R/17's
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Re: V6 4.0 which fuel to use, what to avoid?

Postby dave g on Wed, 01 Jun 2022 10:41 +0000

The computer will have to adjust between the 95 and gas so the figure is still out.
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Re: V6 4.0 which fuel to use, what to avoid?

Postby hotmetal1000 on Wed, 01 Jun 2022 3:43 +0000

I have found with mine that no it doesn't need a few tanks to see the difference in fuels just an empty to full tank and I notice the difference between the fuels.
My experimenting, I did get better fuel economy with 98 over lesser grades but the small gain is out weighed by the extra cost, thus mine doesn't see 98 to often.

Your fuel consumption doesn't sound very flash. Mine has averaged 16L/100Km over 80000 k's with 98, 95 and even E10 being put in it. Larger tyres, bull bar, lifted all the things to ruin economy but then even before I did that stuff it averaged 15L/100km.
I did change the collector in the exhaust where the two banks meet to a more direct flowing joint rather than the horrible t joint it had. That improved my economy by about 1l/100Km at the time.
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Re: V6 4.0 which fuel to use, what to avoid?

Postby Romsey on Wed, 01 Jun 2022 3:54 +0000

dave g wrote:The computer will have to adjust between the 95 and gas so the figure is still out.


My LPG system has a 2nd Toyota ECU which it switches to when I select LPG so does not have to re-learn. I think it has dedicated injectors too.
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Re: V6 4.0 which fuel to use, what to avoid?

Postby Romsey on Wed, 01 Jun 2022 4:04 +0000

hotmetal1000 wrote:I have found with mine that no it doesn't need a few tanks to see the difference in fuels just an empty to full tank and I notice the difference between the fuels.
My experimenting, I did get better fuel economy with 98 over lesser grades but the small gain is out weighed by the extra cost, thus mine doesn't see 98 to often.

Your fuel consumption doesn't sound very flash. Mine has averaged 16L/100Km over 80000 k's with 98, 95 and even E10 being put in it. Larger tyres, bull bar, lifted all the things to ruin economy but then even before I did that stuff it averaged 15L/100km.
I did change the collector in the exhaust where the two banks meet to a more direct flowing joint rather than the horrible t joint it had. That improved my economy by about 1l/100Km at the time.


Yes, worse economy than I was expecting. I do not floor it, am quite gentle with acceleration and carry no loads. I do have a lift but a stock exh & 18" wheels with some cheapo chinese road tyres. It is obviously a lot better on freeway and with 40 psi. My main travels are stop start inner city and my pressures are now 30 psi. I have only run 1 tank of petrol in my ownership recently to see how it would go. I ran it for 300 klm 75% city driving, then filled it and it took near on 60L, it was full to the brim when I started. I have now switched back to LPG. Based on using 20 L /100 with petrol I am expecting to use 24 L /100 of LPG for the same usage. So $24 per 100 klm with LPG vs $42 / 100 klm on 95.
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Re: V6 4.0 which fuel to use, what to avoid?

Postby Romsey on Fri, 03 Jun 2022 10:05 +0000

I just checked my air filter and it was filthy and black on both sides and my air intake had a lot of leaves and other crap in it.

Replaced with a new Repco paper filter and used CRC MAP cleaner to clean the MAP sensor.

I have just checked the car again and idle is now smooth as opposed to hesitating a little when put into D. tested on Petrol & LPG, same improvement.

I have only had this car a month so do not have a great understanding of it's history other than prev owner statements and various recent service receipts.

I do note that it was very rich on startup as evidenced by the fact that whenever I started it I could smell a very rich mixture and if I started it with the exhaust facing my open garage that the rich smell lingered in my garage for at least 1/2 an hour.

Going to take it for a bit of a freeway run now and see if the Toyota in dash Klm / L indicator increases.

I suspect that this dirty air filter and possibly dirty MAP sensor was contributing to my poorer than expected fuel economy, we shall see :)
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Re: V6 4.0 which fuel to use, what to avoid? Fuel Economy

Postby Gipsy on Fri, 03 Jun 2022 10:43 +0000

Yep dirty filters will do that! ;) Dirty filters will change how the ECU sees maf and map and starves the engine of air... New filter makes it breathe much better.
Cheers Gipsy :D although I'm sure somebody will challenge that :lol: even Einstein wasn't certain of his theories.
My 2013 auto D4D DC SR5, prefilter, 3" exhaust and Chip with egt probe, stock SR5 rims with Toyo Open Country AT2 265/65R/17's
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Re: V6 4.0 which fuel to use, what to avoid? Fuel Economy

Postby Romsey on Fri, 03 Jun 2022 12:38 +0000

Gipsy wrote:Yep dirty filters will do that! ;) Dirty filters will change how the ECU sees maf and map and starves the engine of air... New filter makes it breathe much better.


I just completed 50 klm on LPG 70% Freeway & 30% City with 30 psi. The early indicators are very encouraging that changing the air filter & cleaning the MAF sensor have made great improvements.

Before I changed/cleaned I did 100 klm on LPG with about 60% Freeway & 40% City and the Toyota Klm / L was indicating an Avg of 5.8 (for similar use on Petrol it was 6.8). I reset the trip computer and it peaked at 8.8 on the freeway and once I entered the city it dropped down to 7.9 and I expect it to go closer to late 6's or early 7's as I consume more city klm.

Well pleased with this improvement, also idling in D is now smooth and I was unable to detect any Rich fuel smell although that was typically more present when using Petrol.

It will take me more time to properly test this as I do not do that many klm.

I wonder what else I should change or consider cleaning?
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Re: V6 4.0 which fuel to use, what to avoid? Fuel Economy

Postby Romsey on Sat, 04 Jun 2022 11:26 +0000

Just filled up with LPG 38L for 238 Klm 80% Freeway, 31 psi, no load. 100 klm of that was with a dirty air filter & MAF sensor so 16L LPG / 100 klm, $16 per 100 klm.

Really pumped to do the next tank of LPG now that I have a new air filter and clean MAF sensor :) and it should improve if I keep the same freeway ratio which I won't be. I expect to do 70% City driving, have been doing a lot of freeway lately as I am building a motorbike and the parts store is via the freeway, hopefully I have all my parts now :) Based on my research before I bought this Hilux I was expecting to see 14-15L / 100 for petrol & 17/18L / 100 for LPG for combined use.

Now that I have a new air filter and clean MAF sensor I will do another tank of petrol and see if my economy improves from the previous tank at 20L / 100.

If anyone has any other suggestions on any maintenance or improvements I should make to increase fuel economy I am all ears :)
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Re: V6 4.0 which fuel to use, what to avoid? Fuel Economy

Postby Romsey on Thu, 09 Jun 2022 1:39 +0000

This fuel economy data is really my personal log, I don't expect anyone to read it :) I only just bought this 08 V6 Auto Dual fuel DC so I am logging my fuel economy here to get a baseline.

The total klm I have driven this car since buying it on 26/4/22 (237,200) to 9/6/22 (238,864) is 1,664 klm or 1,040 klm per month. It is my only car now as I have sold my Mini on 1/5/22. The 1,040 klm per month is 300 klm per mth higher than the average klm I put on the Mini in the past 7 years. Although for those past 7 years I also had various BMW R12XX GS/GSA's which I did another 4-5000 klm a year on. I now have a Honda CRF 300L bike which will only be used for offroad so I will probably do more klm (~ 500 klm per mth) in the Hilux than I did in the Mini.

9/6/22 Another tank of LPG, was not as good as I expected after replacing the dirty air filter & cleaning the MAF. 39.5L for 227 klm 65% freeway. 17.41L / 100 klm. Prev consumption was 16.45 LPG L / 100 klm with half the tank with a dirty AF & MAF. I must have done a higher % of freeway klm than I prev estimated.

Notes
- I take off 5 klm per LPG tank klm travelled to cover the use of petrol to start the engine before switching to LPG ~ 1/2 klm after starting.
- Above 65% freeway is actual logged klm, previous freeway % was my gut feel estimate.
- 75 klm of above was increased PSI 32F/36R (85% Freeway), 152 klm was 30 psi (57% freeway)
- 10 klm of above was with a 200 kg load in tub, all city driving PSI 32F/36R. All other driving is unladen.

The most LPG I have ever put in the tank is 55L so using the fuel economy figures above of 17.4L /100 klm should mean an LPG tank range of 315 klm for 55L for 65% freeway use. I think the LPG donut tank has a capacity of 58L. From now on I will drive the car on LPG and fill at 300 klm to test the theory unless I radically reduce my freeway use %. My high freeway use % is unusual for me as I have been driving the Hilux to various service places for suspension & other works far away from me and picking up larger personal parcels at depots again located far away. This is not the norm, I mainly drive inner city & suburbs with only short trips on freeways. I expect my LPG per 100 klm to increase to around 20L with less freeway driving and reducing the psi's down to 30.

Overall I am pretty happy with the LPG economy and ~$17.50 per 100 klm which seems on par or slightly under
diesel cost per 100 klm assuming diesel average of 10L per 100 at $2 per L. Petrol cost per 100 klm would be about $30-$31 per 100 klm assuming a petrol average of 15L per 100 klm and 95 RON cost of $2-$2.20 per L. I need to fill it more often than diesel or petrol but this is not a big hassle and I can always switch to petrol until I can find an LPG outlet so no real inconvenience.


I will keep logging my fuel consumption here for a little while until I am completely comfortable with my understanding of the economy of my Hilux.
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Re: V6 4.0 which fuel to use, what to avoid? Fuel Economy

Postby Gipsy on Thu, 09 Jun 2022 3:35 +0000

When you say 'freeway driving' how fast are you travelling? Anything over 100kph will slurp up the fuel no matter what fuel you are using. I would expect LPG is even more sensitive. My diesel uses around 8-10l per 100km on average and at highway speeds it's always 10. You won't get BMW or Mini fuel consumption from a 2 tonne Hilux.
Cheers Gipsy :D although I'm sure somebody will challenge that :lol: even Einstein wasn't certain of his theories.
My 2013 auto D4D DC SR5, prefilter, 3" exhaust and Chip with egt probe, stock SR5 rims with Toyo Open Country AT2 265/65R/17's
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Re: V6 4.0 which fuel to use, what to avoid? Fuel Economy

Postby Gipsy on Thu, 09 Jun 2022 3:58 +0000

Another consideration; when you use petrol to start and warm up you will double the fuel consumption with a cold engine so don't underestimate how that will affect overall consumption.
Cheers Gipsy :D although I'm sure somebody will challenge that :lol: even Einstein wasn't certain of his theories.
My 2013 auto D4D DC SR5, prefilter, 3" exhaust and Chip with egt probe, stock SR5 rims with Toyo Open Country AT2 265/65R/17's
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Re: V6 4.0 which fuel to use, what to avoid? Fuel Economy

Postby Romsey on Thu, 09 Jun 2022 5:52 +0000

Gipsy wrote:When you say 'freeway driving' how fast are you travelling? Anything over 100kph will slurp up the fuel no matter what fuel you are using. I would expect LPG is even more sensitive. My diesel uses around 8-10l per 100km on average and at highway speeds it's always 10. You won't get BMW or Mini fuel consumption from a 2 tonne Hilux.


Hi mate, thanks for your interest. My freeway speeds are typically 80-100 with the occasional 110. I am very gentle with the accelerator in day to day driving.

My 2011 Mini Cooper S Auto 1.6 turbo used 98 RON 9.3 L / 100 klm long term average. Technically about the same cost per 100 klm as the Hilux LPG :)
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Re: V6 4.0 which fuel to use, what to avoid? Fuel Economy

Postby Romsey on Wed, 29 Jun 2022 5:31 +0000

Latest LPG economy. 54L LPG for 260 klm of mainly city driving unladen. Maybe 20% freeway with 200 Kg in tub plus another 10% of freeway unladen. Tyres 33 F 35R. ODO showed 273 klm, removed 13 for petrol use on cold start. 20.7 L / 100 Klm. If I remove 23 Klm for petrol use I am at 250 klm which calcs to 21.6 L / 100 klm. Drives 1-2 klm on petrol on each cold start, I have not accurately logged petrol,running, just an estimate. At $1/per L for LPG it is still costing about the same as diesel to run. LPG sometimes out of stock, have to hunt on occasion. Inner city Sydney. Fortunately my nearest servo in Marrickville has a large LPG tank and always has stock.
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Re: V6 4.0 which fuel to use, what to avoid? Fuel Economy

Postby Romsey on Wed, 27 Jul 2022 4:46 +0000

27/7/22 LPG Fuel Log 4/6/22 to 24/7/22 1204 Klm using 202.62 L LPG = 16.8 L LPG / 100 klm. Est 60% freeway. Over this period probably did up to 54 Klm on petrol for cold starts so say 1150 klm on LPG so say 17.6 L LPG / 100 klm @ 60% freeway. Was pretty much unladen and no towing. Carried 150-180 Kg motorbikes in the tub on about 150 klm of this, no towing. Consistently paid 99.99c / L for LPG. Tyres are 265/70/18 running cold psi of 32F and 35R, once heated up they run 35F and 38R. Heading off overseas until end of Aug so no more updates until Sep.

Conclusions :
Averaging - 732 Klm / Month
Freeway Usage Average - 60%
LPG L /100 Klm - 17.6
Cost per 100 Klm - $17.60
LPG Availability - High, inner city Sydney. Some stations have had outages but my regular in Marrickville OK
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