change your spedometer gear, that will help, i bet that when the PO put the bigger tires on they did not change out the spedometer gear. it will make your odometer off and make you think you are getting worse gas mileage.
new to jeep too lesst han a week , i was cheking this morning on my way to work at 65mph indicated i was at 72 mph on gps. i filled up the tank and after 68 miles (indicated) im almost at half tank.
speedo is wrong, jeep have bad mpg but not that bad.
Not a whole lot you can do - 'jeep' and 'good gas mileage' are mutually exclusive.
I usually get around 14ish in combined driving, so again you're in the ball park. Someone else on this forum put it best, IMO (sorry dont recall who deserves the credit):
It has all the aerodynamics of a barn door, what do you expect?
Some add ons might help - I think my cat back exhaust helped a little, but it will take a loooong time and a lot of driving to recoup the cost. Finally at risk of kind of hijacking the thread, does anyone know if/how much a cold air intake helps?
The bigger tires shouldn't be too much of a problem. they can mess up the speedo, but I don't think they'll mess you mileage THAT much.
Think of a bicycle. the bigger tires, the more surface area, and the more distance you cover with one revolution. the only thing bringing it down would be weight causing your engine to work harder hence less mileage.
I have no maintenance history on the jeep, I need to get a full service done on it , it has 135k miles. I got last night some new spark plug, kn oil and air fliter and will do an oil change. the rest I'll have to bring it to a mechanic, I live in an apartment complex and they do let us do mechanic. the car is leaking some oil a bit. and never start the first time. I need to crank it a few seconds, turn it of and try again and then it start?!! I did the seafoam treatment last night but use only half the bottle, people report a lots of some coming out the pipe, I didn't noticed anything except in the engine compartment..
as far as the mpg, I'll just drive one day with a full tank and set my gps to check the distance, then fill up the tank and double check the usage vs the miles to see what it is exactly.
These things are supposed to get good mileage? I would think with the mods you have and mileage that's about right.... You can always trade it in on another Jeep...
hey , I have a Discovery II which is also like a brick or should I say a pallet of bricks LOL
on the Disco I get about 15 to 17 mpg. but I didn't bought it to save on gas either.
it will only concern me if the mpg is way down which show that there is something wrong.
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