So I knew and didn't expect to get good mpg after adding 305/70r16s the spare to the roof of it creating drag, and the 2.5" lift. But I thought it would be better then 7 miles per gallon haha just seeing what every else is getting with there lifted/big tired Xterra. I did a short calculation: I reset my trip when my gas needle was exactly at full, then took note of the mileage when it was exactly at 3/4 tank. Which was 40 miles, if the tank size is 21 gallon that would mean a 1/4 tank is 5.25 gallons so then you do 40 divided by 5.25 which gives you 7.6 mpg. Now someone please let me know if my math is wrong and I'll admit to being an idiot. Just want to see what everyone else's mpg is.