Nissan Versa only gets 12L/100kms? Shouldnt it get better?
My 98 XJ on 35's with 4.56 gears and auto. Decent load usually, gets about 450kms per tank. I've had better mileage and performance with better fuel. My old yj was very similar. 4.0L, 5 speed, 4.10 gears and 33's. Don't trust the fuel gauge in any jeep. I learned the hard way.
I tried centex fuel because they were cheaper once, and I got 50 less km's on that tank of fuel. So never again. I put shell in regular or premium in all my vehicles and never have any issues. Only have issues when I tried the husky fuel or centex.
It is what it is, if you want amazing fuel mileage then buy a small car. If you want to be cool and get the ladies then drive a jeep:)