Sorry fellas just edited couple of grammar errors in my original post.
Yep both good points, my speedo reads slightly under my actual speed with the factory issued Geolandars (65 profile) on (checked against GPS, Dash Cam and Speedometer App)
Interestingly, the higher profile Mickey Thompson’s (70 profile) make the speedo read spot on accurate.
Obviously the higher profile 265/70/17’s increase the overall diameter significantly and from what I’ve found so far, my luxxy does not like it at all...
Ive also noticed an average 10-20 degree increase in trans and converter temps when running the Mickey Thompson’s, largely due (I imagine) to the trans constantly unlocking the converter and changing back to 5th to maintain speed with the bigger tyres.
The width (265) should have no bearing on the diameter or wheel speed. That said, wider tyres, such as 285’s might add more weight and so may increase fuel usage somewhat, but not wheel speed or distance travelled.
I travel a 505km journey once a week, same route, so it’s a good time and way to do comparisons.
For the sake of comparison, the fuel usage figures I’ve quoted (eg 10.5l/100) are the averages directly from the dash average, not what I have manually calculated.
Ive noticed in other threads and forums that some people are comparing dash read outs to manually calculating actual litres used over distance, which obviously will give varying results, given the issues with DTE and the fact that there is over 100km left in the tank after the dash says “refuel.”!!!
I’m simply doing the 505km drive, maintaining the same speed range (100-110km/h) and logging the differences in fuel usage over those trips.
There are variations each trip such as road works, headwinds, bloody caravanners
etc but on the whole, I’ve noticed quite a difference between the two tyre types, just wondering if anyone else is doing similar tests seeing as fuel usage is a hot topic with N80 owners.
I’m interested to see if anyone knows whether it’s the weight of the 10 ply Mickeys or the larger diameter that is making it use the extra fuel and heating up the trans/conv? I measure the trans temp using pids on the OBD Fusion app for IOS.
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