MPG? (1990 3/4 4x4 suburban) - The 1947 - Present Chevrolet & GMC Truck Message Board Network

XR650RKing · 10-06-2004, 07:56 PM

Hey all I'm looking at purchacing a stock 1990, 3/4ton, 4x4 suburban with rebuilt stock 350 w/ throttle body injection, and Turbo 400 trans and probably 3.73 gears, oh yea 33" bfg AT tires.

What sort MPG could I expect?

I'm a student so cost of fuel is still a concern.

Thanks
JT

*bisquik65* · 10-06-2004, 09:09 PM

Probally would get 10-15 mpg . I have a 80 3/4 with a 350/400 /205 and 35"bfg a/t ta/s and it gets 8-12 empty or pulling a 18 ft car trailer with 2-3 junkers at a time on it. Burb and trailer weight in at 8,000 lbs empty . Have had it weight in at 13,200 at the local scrap yard with 4 79 camaros on the trailer at one time. Looked like the beverly hillbillys were in town.

1987SierraClassic · 10-07-2004, 08:09 AM

I have an '89 1/2 ton 'burb with a fairly new Goodwrench 350 and throttle body injection. It's got 33" rubber and 3.42 gears and I get about 13-15 on average, but I drive it really easy. I'm regearing it to 4.10 to get the engine back into the right power band. It's a little numb with the current gears.

smokkey1 · 10-08-2004, 06:34 PM

3/4 ton might have 4.10's.

my sub get probably around 8-10 mpg that's with 36's,4.10's and th400

STEPSIDE_84 · 10-10-2004, 06:49 PM

anybody no what 3/4 w/454 might get guy here is selling one for 1800 2wd

MASiefert · 10-11-2004, 08:51 AM

Crappy is the answer. My stock 85 GMC 3/4 ton 454 2WD gets about 11. Pulls like nobody's busness though!
MAS

10-06-2004, 07:56 PM	#1
XR650RKing Registered User Join Date: Aug 2004 Location: TN/AL, (GA Currently) Posts: 22	MPG? (1990 3/4 4x4 suburban) Hey all I'm looking at purchacing a stock 1990, 3/4ton, 4x4 suburban with rebuilt stock 350 w/ throttle body injection, and Turbo 400 trans and probably 3.73 gears, oh yea 33" bfg AT tires. What sort MPG could I expect? I'm a student so cost of fuel is still a concern. Thanks JT

10-08-2004, 06:34 PM	#4
smokkey1 Land Beast Join Date: Nov 2003 Location: Los Angeles Posts: 134	3/4 ton might have 4.10's. my sub get probably around 8-10 mpg that's with 36's,4.10's and th400 __________________ 90' GMC 1 Ton Suburban

10-11-2004, 08:51 AM	#6
MASiefert Registered User Join Date: Jul 2004 Location: Dayton, Ohio Posts: 36	Crappy is the answer. My stock 85 GMC 3/4 ton 454 2WD gets about 11. Pulls like nobody's busness though! MAS Last edited by MASiefert; 10-11-2004 at 08:52 AM. Reason: Better Info

10-06-2004, 09:09 PM	#2
bisquik65 Account Suspended Join Date: Apr 2004 Location: N.C. high country Posts: 6,107	Probally would get 10-15 mpg . I have a 80 3/4 with a 350/400 /205 and 35"bfg a/t ta/s and it gets 8-12 empty or pulling a 18 ft car trailer with 2-3 junkers at a time on it. Burb and trailer weight in at 8,000 lbs empty . Have had it weight in at 13,200 at the local scrap yard with 4 79 camaros on the trailer at one time. Looked like the beverly hillbillys were in town.

10-07-2004, 08:09 AM	#3
1987SierraClassic Registered User Join Date: Sep 2004 Location: Buxton, ME Posts: 91	I have an '89 1/2 ton 'burb with a fairly new Goodwrench 350 and throttle body injection. It's got 33" rubber and 3.42 gears and I get about 13-15 on average, but I drive it really easy. I'm regearing it to 4.10 to get the engine back into the right power band. It's a little numb with the current gears.

10-10-2004, 06:49 PM	#5
STEPSIDE_84 Registered User Join Date: Dec 2003 Location: ROCHESTER, NH Posts: 29	anybody no what 3/4 w/454 might get guy here is selling one for 1800 2wd



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