The Official "My Gas Mileage *****" Thread

KJ604 said:

For everyone who is posting their MPG's or L/100kms, how are you getting your numbers? Are people just getting it from the overhead console, or are you doing the math yourself at the pump?

I am asking because I do the math myself at the pump, I do not have an overhead console. I average 16-17 MPG with alot of hiway driving. But I noticed that when I plug my OBDII reader in, it tells me Im getting a much higher MPG then I have ever actually gotten.

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Dave said:

I think you might need to dig out your OBDII instructions and see if there is a way to set the number of gallons your tank holds in order to get a correct mpg reading.


Dave

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metalmoto said:

I might get 12 MPG with a strong tailwind:shrug: 151,000 miles on her. Been replacing something about once a week, when I have the cash. Last weekend replaced water pump and thermostat. This weekend replace cracked radiator and hoses and rear brakes. Still need to replace power steering pump and hoses. Alternator,valve cover gaskets... I feel like I'm throwing my money away!
But a recent 18 inches of snow, made me glad I bought the Jeep. I put her in 4 wheel drive, and just plowed though the white stuff, like it was shaving cream:happy160: Who know how long it will last... My first Jeep and I'm having fun with it! When it dies, I might buy another one, and just swap all the new parts, into the next one...:happy3:

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Bennett said:

Well to be honest this is the number one complaint of many KJ'ers fortunately, there are some things you can do.

Basic Things:
1.) Check Air Pressure of tires, lower pressure = more rolling resistance.
2.) Check to make sure air filter is clean.

Mods:
1.) Cat Back Exhausts are known to help mpg by 1~2 mpg sometimes 3.
2.) Aftermarket Cold Air Intake or Drop in K&N filter
3.) High Flow Catalyic Converter
4.) Some people have mentioned with a throttle body spacer does help. (I can't verify this, because I don't have one)
5.) Synthetic Oil supposed to give maybe 1~2 mpg with a good filter.
6.) Some people mention better spark plugs can help

Things that make MPG go down.
1.) Lots of Lights / Baskets
2.) Bigger Tires
3.) Lift (I noticed after I did the clevis it dropped, but it really didn't change much after my lift-The slight tilt must add better air flow)
4.) Huge heavy sub boxes
5.) Full car load of people
6.) Under inflated tires
7.) Pulling a trailer
8.) Excess drain on alternator
9.) Air Conditioning
10.) Opening Windows
11.) Offroading
12.) Winter Gas
13.) Driving Hard - be nice to it and it will be a little nicer to your pocket.
14.) Excess weight in general - Skid Plates, Brushgaurds ...
15.) The computer gets mad if it doesn't go offroading every month, and deciedes to dump lots of fuel into the motor- So make sure you take her out every once and a while.

As I side not I found my Liberty gets the best MPG at 61 mph.


Bennett

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Liber said:

the best gas ever

I find that I get the best gas milage when my jeep is in park, and turned off. or when it's in nuetral and rolling down a damn hill. other than that it *****. I have a question though....


the 3.7 v6 is not a huge engine but is by no means anyones biaaatch. However it revs very very high. The other day I was stuck behind a stopped bus. I had a car approaching from behind in the other lane about 20 yards back. So I put the pedal to the floor, pulled out infront of the car... the engine almost red lined and I almost got hit cause the friggin jeep did not move forward. It's like a barking dog that has no teeth.

I blame this on a 4 speed auto trans. I almost feel it would pay off (in a year or two) to try and locate a 5 speed, then try and sell the 4 speed. I wonder how much that would cost.

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