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As you can tell, I'm up to 23mpg in April, which I'll credit to the significantly warmer weather we WERE having lol.
My '98 has had a tune up, and I keep the tires aired up to 40psi. It has 4.10's and a 31spline Level 2 rear end, with 31" A/T KO tires
I have the same setup and I am not getting that. I dont drive it like I stole it. I am usually only getting 18-19 average. Worse in the winter. Something must not be right.