Ok so im wondering if I have a 05 hemi ram 4x4 that gets 11.4 mpgs now and I put 33s on it how much is that gonna lower my mpgs? (Im go na do leveling kit also) thanks in advance for ur replies.

 

wow that is some crazy gas mileage I have a 01 dodge 1500 4x4 with 37's and I get 11 miles. But it will probably go down to 10.4 and even 1 more down just depending on how you drive. You should think about putting a chip in it. Thats what I got. U can get more power and a little better gas mileage.

 

Well what size tires do you have now?

Anytime to go bigger and higher you can expect a loss being when you get higher you catch more air and with bigger tires they are usually heavier.

 

Tough for me to compare with my truck since I have so many other mods that help with power and mpgs. I am getting about the same fuel economy around town and only about 1-1.5 worse on interstates at close to 7000 lbs. and with 35" tires as I got bone stock.

I guess a better comparison would be my Grand Cherokee with the 4.7 HO engine. I got about 20 mpgs in combo driving and could just nip 25 mpgs on trips if the terrain wasn't too hilly and I kept it under 75.
A 2" level kit, 2.5" larger diameter tires that were a good bit more aggressive and I'm down to about 17 mpgs in combo driving and around 21 on trips.
There is a lot more than just the tire size. What kinda tread is a big factor as is the actual lift itself. There is a reason these trucks come out of the factory with a big front end rake...