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post #1 of 11 Old 01-26-2011, 07:32 PM Thread Starter
skiebuster
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gas mileage question

04 Grand Cherokee Laredo
v8 4.7 QTII
373 gear

was 17mpg

now down to 14

changed plugs 4 months ago...
KN airfilter
255-65-17 Unlimited rims n tires brand new

no CEL or codes come up

any ideas..
I will be pulling the plugs and inspecting when I get home for the weekend.
other than that...I have no clue

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post #2 of 11 Old 01-26-2011, 07:35 PM
FleshEater
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What size tires were you running with the 17mpg?

2014 JKU Rubicon *DAILY DRIVER*
Gone but not forgotten; 2005 LJ *SOLD* 1987 XJ *SOLD* 2002 WJ *SOLD* 1995 ZJ *SOLD*
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post #3 of 11 Old 01-26-2011, 07:37 PM Thread Starter
skiebuster
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Quote:
Originally Posted by FleshEater View Post
What size tires were you running with the 17mpg?
Same
I lost 1 mpg when I changed them..
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post #4 of 11 Old 01-26-2011, 07:42 PM
narnwv
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Winter fuel blend!!!!
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post #5 of 11 Old 01-26-2011, 07:47 PM
FleshEater
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Were the other tires street tires and these tires are m/t's or a/t's? Have you acquired a heavier foot or let have you been letting it sit and idle for longer than usual do to the colder weather?

2014 JKU Rubicon *DAILY DRIVER*
Gone but not forgotten; 2005 LJ *SOLD* 1987 XJ *SOLD* 2002 WJ *SOLD* 1995 ZJ *SOLD*
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post #6 of 11 Old 01-26-2011, 07:58 PM
joker6
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Winter blend fuel. Mine hit the floor too.
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post #7 of 11 Old 01-26-2011, 08:22 PM Thread Starter
skiebuster
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Quote:
Originally Posted by narnwv View Post
Winter fuel blend!!!!
3 mpg difference????
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post #8 of 11 Old 01-26-2011, 08:23 PM Thread Starter
skiebuster
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Quote:
Originally Posted by FleshEater View Post
Were the other tires street tires and these tires are m/t's or a/t's? Have you acquired a heavier foot or let have you been letting it sit and idle for longer than usual do to the colder weather?
I never let it sit and idle....and the black marks in the road are not mine!
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post #9 of 11 Old 01-26-2011, 08:24 PM Thread Starter
skiebuster
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Quote:
Originally Posted by joker6 View Post
Winter blend fuel. Mine hit the floor too.
Could a higher octane gas make a difference in mpg?
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post #10 of 11 Old 01-26-2011, 08:33 PM
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post #11 of 11 Old 01-26-2011, 08:48 PM
TSyl
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Quote:
Originally Posted by joker6 View Post
Winter blend fuel. Mine hit the floor too.
x3 (is that what we are up to?? ) Mine dropped about 3mpg's too. I am planning on plugs, PCV, fuel filter, front and rear diffs and TCase since it's at about 112k and I've had it since 75k. it runs great but I have no clue what PO did.
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