Question about 2003 Jeep Grand Cherokee

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Gas consumption I am only getting 14.8 miles to the gallon from my 2003 jeep grand cherokee. Am i only to have that amount or should i be getting more miles per gallon?

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  • Anonymous Jan 05, 2009

    I have a similar problem with a 2004 Grand Cherokee (4.7L V8) with approx. 50k miles. I have been getting about 10 miles/gallon on average for about the past 1000 miles. Prior to this time I got around 16 miles a gallon. I park outside and have been running the engine cold in the morning and was wondering if that could contribute to significantly lower gas mileage? Is fuel injector cleaner worth a try? If I go for a tune up is there anything I should make sure I ask for?

  • Anonymous Mar 23, 2014

    onley gets 10 miles to the gallon

  • Anonymous Mar 26, 2014

    erratic reading for fuel remaining,
    average miles per gallon etc.?

  • Anonymous Mar 30, 2014

    Abnormal gas consumption. It has been checked for leaks, gas gauge is correct but the gas is being used up - one mile to the gallon.

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My Answer:

Poor gas mileage can be a result of many many things.

First of all you need to find out what is the factory normal gas mileage for your model year Jeep SUV. It should have said on your window sticker if you bought it brand new. If you are a 2nd or 3rd owner then a Jeep dealer would have info. Google search will tell you as well, and only takes a couple minutes to find.

I did a quick Google search and for a 2003 Jeep Grand Cherokee with a (4.7L V8 engine) the average mileage is roughly 14 mpg.

Not sure what engine you have as to options, etc?

How you drive will greatly change that number up or down depending on a number of driving and driver variables.

A few being -

Driving habits?

Tire pressures?

Engine tuned up?

Lube & oil/filter changes (every 5,000-7,500 miles? Air filter changes (every 10,000-15,000 miles)? Read your auto manual for exact recommended intervals.

How many people in the SUV on average?

Are you towing anything?

Type gas you are burning - BRAND? (See injectors below)

Area you are driving in (hills and valleys verses flat out,
etc)

Jeeps in general don't have a good track record for great mileage, and rough engine idling is always a clue that your fuel injectors are dirty. Typical on all Jeeps with port fuel injection systems! On Jeeps with dirty fuel injectors your mileage will go way down accordingly. If your not putting at least a 12 oz bottle of say Walmart brand Super Tech Fuel Injector Cleaner (~ $1 each) in your gas tank religiously every logged 1000 miles, or every 2 tank fill ups, then you are just inviting dirty fuel injectors and POOR fuel economy!

My 1993 Ford XPLR with a 4L V-6 engine (and ~ 160,000 flawless driven miles) gets roughly 22 miles per gallon on the highway with cruise control on, and about 17 around town on average. I religiously put a 12 oz bottle of the above injector cleaner in my gas tank every 1000 miles!! Of course I do all my own tune-ups, general repairs, and suspension maintenance (shocks, O2 sensors, trans oil changes, lube & oil/filter changes, code reading and clearing, etc) myself and it shows! I don't trust repair shops except for say Tires and Balancing at SEARS.

Hope that helps ease your mind about gas mileage as it relates to your Jeep there.

Frank


Posted on Aug 13, 2008

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