2.8 gas mileage - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 01-30-2000, 02:41 PM
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2.8 gas mileage

hey people out there with the 2.8l FI. what is your ave. gas mileage. mine is like ......12ish arount town. anyone know how 2 get better mileage?

-Tee Rowland

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post #2 of (permalink) Old 01-30-2000, 05:13 PM
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Re: 2.8 gas mileage

Heya,

I have a 1985 2.8l in mine, and I average around city and highway 17 - 21mpg. Some of the best things to do is new coil, distributer, wires, plugs, fresh oil/filter, new fuel/air filters (K&N). Also, pull your carb apart and check it for gunk (and spray a can of Carb-Cleaner in it).

Also, after all that is done, try some HIGH octane gas with gas-line antifreeze and run the piss outta it. After all that, your gas milage should pickup (pun intended) alot. I usually run mid-grade gas in my truck, and it seems to do quite well.

Laters!

Vance - Calgary, Alberta, Canada
1985 4x4 S-10 and 1988 Jeep YJ
post #3 of (permalink) Old 01-30-2000, 05:26 PM
 
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Re: 2.8 gas mileage

My carb setup is running 16 - 20 MPG right now.

--Drew
83 S10 Ext Cab
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post #4 of (permalink) Old 01-30-2000, 05:29 PM
 
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Re: 2.8 gas mileage

My carbed 2.8 gets around 15 city and a little better highway... The carb is kinda messed up, so it's probably a bit lower than it should be... [img]/wwwthreads_images/icons/crazy.gif[/img]

Tim
"The_Sandman_454"

[img]/wwwthreads_images/icons/cool.gif[/img] '79 Suburban 4x4 454, 6" lift, 35x12.5s & '85 GMC S15 4x4
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post #5 of (permalink) Old 01-30-2000, 10:37 PM
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Re: 2.8 gas mileage

My carbed 2.8L gets all kinds of millage. Summer it gets 15 city, 18 highway, and winter it gets 13 city and 17 highway. I assume my truck gets lower than average because it runs too rich, and burns a little oil.

The Duke

There's somethin' women like about a pickup man
post #6 of (permalink) Old 01-31-2000, 12:18 AM
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Re: 2.8 gas mileage

in the summer 15
In the winter 15
On the highway 15
In the city 15
Consistantly sucks.
(1988 2.8 FI, 4.10's and 31's)

post #7 of (permalink) Old 01-31-2000, 12:20 AM
 
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Re: 2.8 gas mileage

yes, but consistency is definitely the key here, huh? [img]/wwwthreads_images/icons/wink.gif[/img]

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post #8 of (permalink) Old 01-31-2000, 01:21 AM
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Re: 2.8 gas mileage

18-21 with a lead foot and 30" tires, here in south florida I run the A/C year round(life sucks)
electric cooling fan helped a lot.
Other good mods:
senthetic oil-diffs(80w), gear box(5w-30), tcase(5w-30) eng(5w-30)
Power Pullies(2-one on the crank,one on the alt.)
K&N filter kit
headers (If you keep your foot out of it)
a good tune up (Jacobs MilageMaster a big plus-had one on my Toy)

Run a bottle of Cheveron Tecron additive in a tank of gas,the stuff is great for
cleaning up the intake track. It's a long story, but BMW and Mercedes use
this as a fix for heavy fouling on intake valves.

HAWG WILD
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post #9 of (permalink) Old 01-31-2000, 05:23 PM
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Re: 2.8 gas mileage

can u tell much differance with a K&N air filter performance wise? i was thinkin about gettin one because a bunch my friends w/ Z71's got em and relly like them. my dad tells me that it probally wouldnt help out a lot with the 2.8L.soooo..... if anyone has one on a 2.8 let me know what u think.....

-Tee Rowland



post #10 of (permalink) Old 01-31-2000, 11:35 PM
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Re: 2.8 gas mileage

I get 15-16 in town and 18-19.5 hiway with my 3800-4000 lb Trooper with 2.8 TBI 5-speed, and 4:56 gears. Sounds like yours has a problem, it should get better than 12 no matter what. If you have larger-than-stock tires, it could throw your odometer off. Check it against the mile markers on the hiway and see how accurate it is.

You could have a plugged cat and/or exhaust, time to upgrade to a larger dia (2-1/4" or 2-1/2") system with a free-flowing cat. Should help with power and MPG.

If you have a lot of miles on the motor, the O2 sensor could be getting worn out. Replace with a new one.

Increase the timing from 10 deg BTDC to about 14 deg BTDC, it will be snappier and probably better mileage too. Consult the manual for instructions on jumpering out the diagnostic plug when adjusting the timing.

Flip over the air cleaner lid for better airflow; also a K&N filter helps and you'll never have to replace it (only clean occasionally).

If the engine is worn out, obviously it will get poor mileage. If you suspect this is so, do a compression check. If you find a cylinder which is drastically lower than the rest, that would point to a problem. Good Luck....ed

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