i am now looking into getting new rims and tires for my truck and also getting a six inch suspension lift. i want to get 35s put on but a friend told me that starting at 35 and going up, your gas mileage will start to decrease noticeably. is this true?

 

im getting 10-11 in the city and 12-14 on the highway running 35 micky atz and 3.73 gears

 

There are plenty of guys on here that have re-geared in order to gain back what was lost after lifts and bigger tires.

http://www.novak-adapt.com/knowledge/gearing.htm

This link was poted up on here somewhere. Might help you with the gear info.

Edit: The OP was MHC-150. Borrowed your link brother.

 

there is no set tire size when mpg's drop off. i run 37's and i get about 14mpg in the city and about 17-18mpg on the freeway. i have 4.88 gears

 

alright thanks everyone