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 -
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
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,
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
Hope that helps ease your mind about gas mileage as it relates to your Jeep there.
Aug 01, 2008 |
2003 Jeep Grand Cherokee