i got close to a 3 inch lift on my 06 LTD V8 2wd. i do a 40 mile traffic commute (round trip) everyday and i am getting between 17 and 17.5 per gallon. i get that average from the number of miles i have divided by the amount of gas that i put in...i always fill up before i go empty. just topped off the tank tonight with 17.5 gallons with 298 miles traveled so i got 17.01 miles/gallon on that last tank.