how many mpg's does your 2.9 get?

wrecking-crew

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dirty jersey

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06 chevy

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• Jul 26, 2009

• #1

post what your truck has such as how many miles you have, auto or manual trans, gear ratio, any engine mods or rebuilds(replacement panel filters dont count unless k&n or other "high performance" filter), oil weight and brand (10-30, 5-20, ect) and oil additives(lucas and such), tire size and type, and lift or lowering kits

mine gets around 20 combined
146kmi 88 supercab
stock height supercab stx w/ 3.93 posi rear, no engine mods(yet), manual trans, whatever weight a 18wheeler uses w/ half a quart of lucas, running mags with 235 75 15 tires 3 h/t tires and one a/t tire

(dont make fun of me. im bored)

now someone else goes.

puropse of this thread, get eveyone with a 2.9 better milage and better running engine to last them a while

 

holyford86

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Plattsburgh

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many

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Total Lift

7

Tire Size

33x12.50R15

• Jul 26, 2009

• #2

17.5-18.5 combined
MAF conversion
4.10 gears
33x12.5 tires
6 inch lift
10w40 castrol
M5OD trans
~135k on engine and trans 289k on the rest of it

 

Alohanigel

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1988

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• Jul 26, 2009

• #3

mine runs like shit n gets about 13

 

RustedRanger

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Farmland IN

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1987

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• Jul 26, 2009

• #4

Mines a 4X4,regular cab,5 speed with a 2in glasspak and a Spectre cone air filter on the stock intake tube,225-70-15 tires and many new parts and tune up. I been getting 22mpg mostly highway and country driving,that was with 10W40 semi synthetic and Restore in the oil. I just put in Castrol Syntec 10W30 and Restore in it and replaced a weak coil and bad coil plug in and just filled up the tank again. It just turned 150,000mi. the other day.

 

Frank The Tank

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South

• Jul 26, 2009

• #5

You Guys have the floor shifters with the auto 2.9's too?
I loved that feature!!!!

Mines an 88
auto trans
2wd
reg cab
long box
275k miles
about 75 psi compression in all cylinders
16mpg average
straight 50 weight oil, with lots of additives.
fresh air filter and trans filter when needed.


trans was going out, slipping, lost OD etc....... for last 20k miles. she got down to about 12mpg.

Frank

 

baxtej44

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City

Omaha, Nebraska

Vehicle Year

1988

Transmission

Automatic

• Jul 26, 2009

• #6

88 2.9L 4x4
86,xxx miles

stock all the way pretty much.


i feel like mine is really low... 14 city

 

chandymanusa

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46

City

Clarksville Tenn

Vehicle Year

1988

Transmission

Manual

• Jul 26, 2009

• #7

1988 stx highrider stock reg cab
120876 miles
3.93 gears posi rear
2.9 no mods
running Lt 235/75/15 6ply rear, 215/70/15 front
10w30 walmart oil n filter run it in all 5 of my cars
avg 20 mpg

 

Cyberbeer

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Spotsylvania, VA

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1987

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• Jul 27, 2009

• #8

87 4x4 STX. Super cab Stock Height
3.73 gears 235/75/15 All Terrains
2.9 Stock
Mobil 1 Synthetic with BG MOA additive
FM145 Tranny 5 spd standard
103,000

18-20 mpg

 

Jspafford

Logan Andrew Feb 17, 2012

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Lancaster, Ohio

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2016

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5"

Tire Size

35"

• Jul 27, 2009

• #9

2.9L
165K
M5OD
4x4
Manual T-case and Hubs

17-24

 

tanbuddy

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446

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Poconos, Pa

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1989

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• Jul 27, 2009

• #10

mods in my sig,
10w30 cheap oil
16-18 in town
didnt have it on the highway in years but i used to get 23 when it was mostly stock.

 

JAB

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Messages

12

Vehicle Year

1988

Transmission

Automatic

• Jul 27, 2009

• #11

15 Mpg

My 1988 Ex Cab 4X4 gets about 15 MPG. Running 31's with stock 4.10's. Cone air filter. A little timing and aftermarket muffler.

 

fastpakr

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Roanoke, VA

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1999

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Transmission

Automatic

Tire Size

285/75-16

• Jul 27, 2009

• #12

I'm assuming that was a request for comment... Recent tuneup? Fuel filter? What is the timing set at? Run KOEO and KOER tests?

 

Area 52

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Newport Beach, CA

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1990

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• Jul 27, 2009

• #13

Did you re-gear the speedometer to assure accurate mileage on the odometer?

 

JAB

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Apr 13, 2009

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Vehicle Year

1988

Transmission

Automatic

• Jul 28, 2009

• #14

I have not re-geared the speedo yet. It reads about 5 MPH slow on the freeway. I have not tried to pull any codes yet, and that brings a question. I can not find the plug on the harness to plug the ODBI reader into. I could also not find anything to do a test light test on. The timing is set about 2 degrees less than "ping" with regular gas.

 

Last edited: Jul 28, 2009

fastpakr

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Roanoke, VA

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1999

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Transmission

Automatic

Tire Size

285/75-16

• Jul 28, 2009

• #15

Harness should be on the passenger side fender well, if I'm remembering correctly. When you set the timing, did you unplug the SpOut connector? If not, go back and unplug the connector then set base timing to 10-12 degrees BTDC (with the engine warmed up).