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Unread 10-14-2013, 08:46 PM   #1
Chefdanb
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1988 YJ Wrangler 
 
Join Date: Aug 2013
Location: Ft Lauderdale, FL
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What should my MPG be for my 88 YJ?

Hey there,

Still new to the Jeep world and loving it. I have recently did a 2.5 lift with 31inch tires.

I have a 20gal gas tank and I seems to only be getting 10mpg....I am willing to accept low milage but I feel that getting only 10mpg is a bit low.

Any thoughts on how I can get more MPG???

Thanks in advance for the help.



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Unread 10-14-2013, 09:33 PM   #2
pat_v18
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I have noticed a difference with using the mid grade has over the "crap" gas. It have less ethanol which allows the fuel to burn slower. An intake would also be helpful. And maybe an engine tune up
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Unread 10-14-2013, 10:21 PM   #3
AmmitOsiris
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1990 YJ Wrangler 
 
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Quote:
Originally Posted by pat_v18
I have noticed a difference with using the mid grade has over the "crap" gas. It have less ethanol which allows the fuel to burn slower. An intake would also be helpful. And maybe an engine tune up
I have not heard of intakes helping mpg or power..

Give it a tune up, make sure your o2 sensor is working change your air filter, proper tire pressures, proper gearing, . All come into play.

I have a 90 with the 4.2 and I get about 10.. On the uncorrected speedo

Sent from Peggy's office
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Unread 10-14-2013, 10:30 PM   #4
Tom95YJ
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I am getting 21mpg hiway and 18.6 city in my 89 YJ with a 4.2L I am running a Nuttered Carter BBD carb, with a fresh set of Champion Copper plugs, new plug wires, Dizzy cap and rotor. I also have replaced every fluid in my YJ with synthetic. I am running a 235/75/15 tire so its not much smaller then a 31

I suggest starting with a tune up and doing the nutter bypass
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Unread 10-14-2013, 10:35 PM   #5
pat_v18
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Quote:
Originally Posted by AmmitOsiris
I have not heard of intakes helping mpg or power.. Give it a tune up, make sure your o2 sensor is working change your air filter, proper tire pressures, proper gearing, . All come into play. I have a 90 with the 4.2 and I get about 10.. On the uncorrected speedo Sent from Peggy's office

Better air to the engine, the better it runs. Which means less work for the engine. I've read a few threads with guys getting better gas mileage with snorkels!
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Unread 10-14-2013, 10:50 PM   #6
JimWilliamson
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1990 YJ Wrangler 
 
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A bit of a different realm (MPFI vs. carb) so maybe I shouldn't post, but I'll toss mine into the mix...

90 MPFI converted 4.2, manual trans, 4.10 gears, 35"s

13-15 MPG is common.

I often run mid-grade fuel to reduce pre-ignition when in the mountains but it does get low grade fuel when I'm back to the flats.

Rare numbers can see 7.8MPG as well as 20MPG.

GPS & corrected speedo so the numbers should be true.
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Unread 10-15-2013, 07:16 AM   #7
superj
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10-15 in my 87, stock size tires
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Unread 10-15-2013, 07:32 AM   #8
irnmadn88
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Did you change the speedo gear?

My old 88 J would get about 15 mpg in town with a Weber 32/36 and being careful with the skinny pedal...
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Unread 10-15-2013, 07:44 AM   #9
JBTJ
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Quote:
Originally Posted by irnmadn88 View Post
Did you change the speedo gear?

My old 88 J would get about 15 mpg in town with a Weber 32/36 and being careful with the skinny pedal...
X2 Unless you did nothing else matters. You must start here, then check your MPG's. I bet you will find it's better than you think.
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Unread 10-15-2013, 09:07 AM   #10
waif69
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I'm getting 11mpg with 31s and a corrected speedo. 4.2l with a MC2100 carb and HEI ignition.
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Unread 10-15-2013, 09:21 AM   #11
Beachcruiser
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'87 w/ 4.2, AX-15 w/ 3.07 gears, 2" lift, Nuttered, Team Rush mods (including dizzy), MC2100 & 31's (with uncorrected speedo)....over 75 miles on 5 gallons (mixed driving, mostly city). So 15ish.....gets around 20 on long drives to the coast.
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Unread 10-15-2013, 08:39 PM   #12
yellow2kgt
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4.2 with 180k miles, Howell EFI, TF999, 4.88 gears, and 35s. I usually average around 12mpgs. I admit my YJ is on the heavy side with the 8.8, winch, full engine skid, and rockers. If I let my wife drive it she can squeak out around 14mpgs.
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Unread 10-16-2013, 10:47 AM   #13
1998zj
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My stock 89 got 15 mpg when I had it.
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