average MPG out of 4.2L YJ?

JayJEEPguy · 12-09-2003, 08:24 AM

Just a bit curious, but what do you guys average for fuel consumption in your YJ's?

I know my carb has been acting up, but since I bought the Jeep I have not gotten over 11mpg. Please tell me that you guys average more than me

.

BTW, my 4.2 is stock, with a 5 speed, 3.07 gears, and 30" AT tires.

Thanks.

xxxflhrci · 12-09-2003, 09:07 AM

'89 4.2, 5 speed, stock gears, 32 BFGs, Weber carb. I get between 11 and 13 mpg.

smok3y · 12-09-2003, 10:03 AM

90 4.2 stock gears, 31x10.50 no lift...8-10 with POS carter

Bob K · 12-09-2003, 10:42 AM

About 12 around town, over 15 highway and backroads.
Doesn't sound too bad compared to some others.
But the GPG (Grins per Gallon) are higher than any vehicle I've ever owned.

JayJEEPguy · 12-09-2003, 11:06 AM

Quote:

Originally Posted by Bob K

About 12 around town, over 15 highway and backroads.
Doesn't sound too bad compared to some others.
But the GPG (Grins per Gallon) are higher than any vehicle I've ever owned.

Hahaha That is certainly one way to put it, Bob

Yeah, I guess it could be worse.... I just thought it would get slightly better than it does. Guess I'll have to live with it.

Sadly, this Jeep is not the most gas-guzzling vehicle I've owned.

My last 4WD truck was a '79 Ford Bronco with 351M/ 4 speed, and 35's..... I averaged about 8mpg in that hog!

Moxley · 12-09-2003, 11:24 AM

JaySHOguy,

Here's what your Jeep got new:

Later,
Doug

**Bigbluejeep** · 12-09-2003, 11:42 AM

12 here, I'm glad someone asked this question, I was wondering if I was running about average with everyone else or not.

JKNIPE2000 · 12-09-2003, 11:44 AM

Well if our Jeeps got 16-20 new, could anyone tell me what i could replace to maybe restore that gas mileage...im getting 12 city, an 10 highway (not sure why).
also, does anyone else w/ the stock 4.2 have problems going 70 even downhill? Mine seems to bog down...maybe burning too rich, not enough air? im very responsive in neutral, but under driving load, very sluggish.

JayJEEPguy · 12-09-2003, 11:47 AM

Doug, that picture is great. Answers many good questions

Now, if I could manage to even get 15mpg on the Highway I would be so much happier

My commute to work right now is 40 miles combined. Come late January, my driving will be even longer.

wr70beh · 12-09-2003, 11:56 AM

88 YJ with 4.2L 6
2.5" lift
30" BFG KO's
Weber carb conversion

I'm getting around 13 in town and 16 on the highway. I thought that was horrible but seeing what you guys are getting I don't feel so bad now.

ramsdell_ · 12-09-2003, 02:27 PM

Ok I have a 4.0 last year when it was stock 29" or 30" tires with 3.55 gears the best i could get was about 22mpg on the highway.

Now I have 33" tires with 3.73's and i average about 16-18mpg.

does the 4.2 drink that much more gas.

My uncles 69 camaro w/ a built 350 gets 10mpg (if you keep your foot out of it

)

wr70beh · 12-09-2003, 02:53 PM

Quote:

Originally Posted by ramsdell_

Ok I have a 4.0 last year when it was stock 29" or 30" tires with 3.55 gears the best i could get was about 22mpg on the highway.

Now I have 33" tires with 3.73's and i average about 16-18mpg.

does the 4.2 drink that much more gas.

My uncles 69 camaro w/ a built 350 gets 10mpg (if you keep your foot out of it

)

It's gotta be the carb. EFI for the most part gets mucho better mileage.

xxxflhrci · 12-09-2003, 04:04 PM

Quote:

Originally Posted by ramsdell_

Ok I have a 4.0 last year when it was stock 29" or 30" tires with 3.55 gears the best i could get was about 22mpg on the highway.

Now I have 33" tires with 3.73's and i average about 16-18mpg.

does the 4.2 drink that much more gas.

My uncles 69 camaro w/ a built 350 gets 10mpg (if you keep your foot out of it

)

Yours is performing miracles to get that kind of mileage.

The 2004 4.0s with stock tires are only rated at 16/19.

xxxflhrci · 12-09-2003, 04:06 PM

Quote:

Originally Posted by Moxley

JaySHOguy,

Here's what your Jeep got new:

Later,
Doug

Where's the engine size? I'll bet that chart is for the 2.5. The new 4.0 is only rated at 16/19.

**DanG** · 12-09-2003, 06:04 PM

i average 8 mpg, the best i have ever gotten is 10 on highway trips with the top and doors on. when i had 31"s with the 33"s i dont want to know.

12-09-2003, 10:03 AM	#3
smok3y Registered User Join Date: Jun 2003 Posts: 399 Profile Gallery Classifieds My Jeeps	90 4.2 stock gears, 31x10.50 no lift...8-10 with POS carter __________________ 1990 YJ/ 31x10.50 Maxxis Mudders/Removed Sway bar,Rear trac bar/tow hooks. 2" straight pipes from manifold back [COLOR=white]White Jeep Club #73,999,999[/COLOR]

12-09-2003, 10:42 AM	#4
Bob K Registered User Join Date: Nov 2001 Location: New Bedford, MA Posts: 990 Profile Gallery Classifieds My Jeeps	About 12 around town, over 15 highway and backroads. Doesn't sound too bad compared to some others. But the GPG (Grins per Gallon) are higher than any vehicle I've ever owned. __________________ '87 Wrangler YJ 4.2 I6 (sorry, sold) JuiceBox ignition 2 1/2" ProComp Lift 31" BFG A/T's K&N Filter Custom Rock Guards Turbo Muffler Rear Track Bar in the shed Other Tricks I won't tell to just anybody! '99 Grand Cherokee 4.7 V8 Towing Package K&N FIPK ProComp MX6 shocks Borla Exhaust Tow Hooks Alpine CD with Infinity+iPod connect Just getting started! If you're not living on the edge... you're taking up too much space.

12-09-2003, 11:24 AM	#6
Moxley Registered User Join Date: Jun 2003 Location: Hagerstown, MD Posts: 909 Profile Gallery Classifieds My Jeeps	JaySHOguy, Here's what your Jeep got new: Later, Doug __________________ 1995 YJ Wrangler - 2.5 Liter, 5 Speed Trans 4" Lift (3" Suspension, 1" Body) - 31" Firestone Tires Outlaw II 15x8 Rims - 6" Best Top Fender Flares [color=darkred][b]My Jeep:[/b][/color] [url]http://members.myactv.net/~douglas.moxley/jeep.jpg[/url] "A high IQ is like a Jeep; you will still get stuck, just farther from help"

12-09-2003, 11:42 AM	#7
Bigbluejeep Junior Member Join Date: Nov 2003 Location: Greenville, SC Posts: 67 Profile Gallery Classifieds My Jeeps	12 here, I'm glad someone asked this question, I was wondering if I was running about average with everyone else or not. __________________ 89 Yj 6cyl Weber 4" Lift Welded Tow Hooks Front & Rear Soft Top (hard top got lost in a rollover) KC Daylighters 55 watt running lights mounted in Frame for Night Rockin 33/12.50/15 Buckshot Mudders Rear Lock-rite (best mod ever!) Detroit Front Locker Flowmaster 2" BL [SIZE=5][URL=http://www.bigbluejeep.com]www.BigBlueJeep.com[/URL][/SIZE]

12-09-2003, 11:44 AM	#8
JKNIPE2000 Registered User Join Date: Dec 2003 Location: HEDGESVILLE, WV Posts: 644 Profile Gallery Classifieds My Jeeps	Well if our Jeeps got 16-20 new, could anyone tell me what i could replace to maybe restore that gas mileage...im getting 12 city, an 10 highway (not sure why). also, does anyone else w/ the stock 4.2 have problems going 70 even downhill? Mine seems to bog down...maybe burning too rich, not enough air? im very responsive in neutral, but under driving load, very sluggish. Last edited by JKNIPE2000; 12-09-2003 at 11:47 AM..

12-09-2003, 09:07 AM	#2
xxxflhrci Registered User Join Date: Jul 2003 Location: South Posts: 3,643 Profile Gallery Classifieds My Jeeps	'89 4.2, 5 speed, stock gears, 32 BFGs, Weber carb. I get between 11 and 13 mpg.

12-09-2003, 11:56 AM	#10
wr70beh Registered User Join Date: Nov 2003 Location: Richmond, VA Posts: 27 Profile Gallery Classifieds My Jeeps	88 YJ with 4.2L 6 2.5" lift 30" BFG KO's Weber carb conversion I'm getting around 13 in town and 16 on the highway. I thought that was horrible but seeing what you guys are getting I don't feel so bad now.

12-09-2003, 06:04 PM	#15
DanG Member Join Date: Jun 2003 Location: RHODE ISLAND Posts: 418 Profile Gallery Classifieds My Jeeps	i average 8 mpg, the best i have ever gotten is 10 on highway trips with the top and doors on. when i had 31"s with the 33"s i dont want to know. __________________ 89 RED YJ sitting in driveway next to wrecked car [URL=http://www.cardomain.com/id/djg6678]my jeeps page[/URL] [SIZE=4] [COLOR=red]NE[/COLOR][COLOR=white]Off[/COLOR][COLOR=blue]Roading[/COLOR] [/SIZE] H2RT MEMBER [color=red] RED JEEP MEMBER #49[/color] POS JEEP MEMBER #3