Quote:
|
Originally Posted by r5active
Is there a way to increase gass mileage on a 98 jeep cherokee 4.0 6cyc. I was thinking of increasing the tire size. Has anyone tried that? will it work? thanks ken
|
I dont think you will see much, if any MPG difference by going up a tire size or two. Its not really the RPMs that determine your MPG as much as throttle position. The more air you let into the engine, by pushing the accelerator, the more fuel thats going into the engine. Larger tires may actually hurt your mileage under some condtions because it takes more throttle to get them rolling. Once on flat interstate, the big tires will probably help, but around town or on hills, they will probably hurt.
There are alot of aftermarket intake and exhaust pieces that are supposed to increase mileage. I dont personally buy into them. They may help a little but by the time you spend several hundred for them, you are are the hole to save fuel. The best way to save fuel is to make sure your Jeep is in good operating order (ie: tuneup, tire pressure, lube, etc) and modify your driving habits by slowing down, timing lights, slow takeoffs, etc.
I know thats not the answer people like to hear, which baffles me because its FREE. It seems most people would sooner spend $300 to get 2 MPG more than slow down a little for free and get 2 MPG more. It just doesnt make sense to me
. Anyway, thats my take on it.
EDIT: Oh,yea, Ive got 30" tires on my XJ with stock gearing. No noticable change in average MPG. I did notice a small power derease though.