Tacoma Tire/Lift?

i have a 2005 double cab trd sports package stock with the stock freeway tires that are 17x65x265 and i currently can go 340 miles on a 17 gallon tank for 20mpg average. does anyone know what mpg i will get if i get the bf goodrich all terrains same size tire 17x65x265? also a lot of people are telling me to get the 3" lift front and 1" lift in rear with possibly the 17x70x275 or even 17x70x285...what will my mpg be with those combinations? any suggestions or advice?

 

its 285\70-17.. Im running 285\70-17 M\T tires on 3 inch lift. I get about 260 city driving and like 310 highway miles.

 

Hard to say exact numbers...You can expect it to go down a little bit with the AT tires- They are heavier and have a bit more rolling resistance than the HL/HT type tires. WIth a lift and larger tires it will go down a bit more.

 

I'mr unning 285 mud terrains and I get about 250-270, depending on the driving.