hey ken what size tires do you have?

 

Has anyone else noticed this thread is almost 10 years old?

 

wow... had no idea

 

Someone's been digging up old threads again.

 

No - I didn't see that either.

hittman1422 - I've just got 235/85-16's on

 

I have a 1985 f150 xl w/ 6" lift 35" tires, 351W, holley carb, heavy duty bumper.....Only getting 5-6mpg. Why would this be? carb was jetted down two sizes and hardly made a difference.

 

Probably the combination of the 6" lift and the 35" tyres giving you approximately 34.2% more frontal area that you're trying to push through the air as you travel along. Now, given that aerodynamics is an inverse square relationship, stands to reason that your MPG is about 1/3 what it should be.