Sounds about right, easy right foot helps a lot... Try getting over 800km, it's possible
if you do the math 79litres gives you 790km @10ltr per 100km so you're nearly there, you probably already are if you didn't run it dry
there's another 100km in the tank after the light!
Edit: oops better let you know, don't run it dry because it causes lots of problems, but if you remember what fuel you put in to fill it and minus that from 79ltrs you know how much is left in the tank... And the fuel consumption meter isn't too accurate so whenever I fill up I check the actual consumption figure using the math... Litres in divided by kilometers (hundreds) ie 69ltrs in divided by 6.9 (hundreds km). The only other thing is that the fuel pump doesn't always deliver what the gauge says.
Cheers Gipsy
although I'm sure somebody will challenge that
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