I have an 2005 f150 5.4l 4x4 supercrew....i have an 2.5 leveling kit and 32 inch tires.....if i put 33 inch tires with 17 inch wheels will it hurt my MPG just going 1 inch bigger on tires??
Thanks

 

nope im running 285 70 17 BFG mud terrian KM2 and my mpg has not changed

 

Yes it will but depending on how you drive it you can make up for it. anytime you go up in tire size you run the risk of loosing gas mileage. i went form 31's to 32.7's (285/75R16) and i lost about 1 mpg as long as i dont drive it like i stole it

 

you lost mpg by going to a bigger tire?

 

Almost everyone does...

 

Yup... its cuz of the fact that your pushing more rubber around and heavier so it takes more to do the same you did with stock tires.

i got about 16.5 MPG on the first tank after doing the "Gotts" and K&N drop in then i got the 33"s and went to 14 for the trip to college station (cuz i average 85) and then back to 15 on last tank.

 

thats interesting you would think that you would get better cause its a longer distance with one revolution

 

its mostly about the weight difference and has to do with more torque required with a bigger tire. it comes down to physics

 

The distance is negligible compared to the added weight.

 

Increased tire weight, tire resistance do to larger width, higher truck air resistance all contribute to using more power to do the same work. This means more gas and lower mpg...

 

Do you have pics of your current setup?

Like others have said, and from my extensive research on this subject, I'd say you'd lose .5-1mpg if your driving habits don't change.

 

Srry do not have a pic.....so from going from 32 inch tires to 33 inch tires will really make a differnce???
cant believe that 1 inch will make a difference
Does the K&N cold air intake help the MPG
Thanks for the info
newbie to all this stuff

 

Not sure if it would make a diff or not. The .5-1mpg I'm refering to is from stock (255's) to 285's, thats what guys are telling me.

The CAI on the 3v 5.4's need a tuner to make the motor run right. They lean out with just a CAI and can cause catastropic failures. I wouldn't suggest it unless you have a tuner/get a tuner with it.

 

Is there anykind of air filter i can put in without having to get a tuner that can help out with the MPG?

 

I put a K&N drop in, in my truck. Soley because I got a huge discount and its reusable. It did 'feel' like there was a bit more throttle response, but MPG didn't change til I did the exhaust, then it went up a solid 1.5mpg. This is over about 5000 miles of driving since then.

Its a truck, MPG is always going to be low/suck! HAHAHA