Mpg? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

green724x4 · 06-07-2007, 10:23 AM

Hey guys, just figured out what mpg is on my 72 is like 8mpg

went 105 miles on 13.1 gallons of fuel. What MPG are you getting.
Iam running
33"x12.50s

I believe 3:73 or 3:08 gears orignal from factory
350 w/th350
Is this about average?
Hows your MPG?

1969k10stepside · 06-07-2007, 10:40 AM

3:73 gears front and rear.350 motor bored .06 over. 825 CFM Holley.Edelbrock Performer intake.Turbo 350.A/C.6" Lift.35" Tires...No gas tank at the moment.Motor still needs a pulley system and distributor,wires, and plugs to run...so I figure about 0 mpg.No tank,non running motor

Hopefully I get above 10 mpg when it does run...but I doubt it does.You have to factor in the truck body which is half bondo until I get to working on the body panels again..

Mudder · 06-07-2007, 10:56 AM

I believe I am getting around 10 with a 383 Stroker 4.10's and 35's. Hard to tell when the speedometer is off.

snj8198 · 06-07-2007, 11:01 AM

496 Edelbrock MPFI, Edel alum oval port heads, Comp 270H 4x4 cam, NV4500/205, 4.11's, 255/85 R16, 13mpg hiway/ 9.5mpg in town. Or 2mpg if i stuff my foot in it! -steve

Elwayno · 06-07-2007, 11:27 AM

69 Suburban with stock ?? gears and 31 x 10.5 tires. Four speed with a 205. It did get 16mpg highway before the lift. Not sure now.

Gotta remember automatics suck...up a lot of gas anyway.

ericguy320 · 06-10-2007, 10:50 AM

72 k5 top off 3.08, 33" tires, sm465, 30 over 350 vortec heads comp cams 4x4 226-234 111 lsa bump stick, road demon 625 carb 93 in the tank. I got 10 mpg when i went to boone last summer all 60mph

**special-K** · 06-10-2007, 06:28 PM

I just always guess about 10.

vegas_k10 · 06-15-2007, 01:00 PM

lol mild 350, sm465 4 spd, 3.73 gears and 38.5's i get about 10-12 around town and less on the interstate.

knsmodels · 06-15-2007, 01:46 PM

350/4spd....4:10's with 33 inch tires....can get 12/13 on the highway.....no idea around town.....when it gets near E I just filler up...lol....still better than a new truck payment......

johnnywagon · 06-15-2007, 02:28 PM

EIGHT MPG. 37" Swampers w/4.10 gears. Mild 350 w/Q-Jet. Thats w/the top off. Put the super heavy deluxe top back on and.....?????

Musclerodz · 06-15-2007, 03:12 PM

PO said before he quit driving the K5 he got about 15mpg. That was with a 350/350/205 with 2 barrel carb on 31" tires and 3.73 rear. It now has 400hp LT-1, 4l80e, 205, still 3.73 rear, and getting 33" tires, but not done yet. I am hoping to still get 15mpg or better or I am going to be pissed.

Mike

vtblazer · 06-15-2007, 03:52 PM

Never even check it...

RED72blazer · 06-15-2007, 06:18 PM

My best around town is 12, 15 on the highway...but that's driving like a granny.

cell · 06-15-2007, 06:49 PM

inline 6 with 1 bbl rochester (permanently jetted rich, unfortunately): about 9 MPG.

swapped ring and pinion from 3.73 to 3.08 and noticed a small bump (about 1 MPG).

**special-K** · 06-15-2007, 07:48 PM

Quote:

Originally Posted by cell

inline 6 with 1 bbl rochester (permanently jetted rich, unfortunately): about 9 MPG.

swapped ring and pinion from 3.73 to 3.08 and noticed a small bump (about 1 MPG).

Man,put a big block in there and save some money on gas

.

Fry · 06-17-2007, 02:04 PM

My old 75 blazer on 33s, 4.10s, th350, 305 & 4 bbl got 19mpg highway after I rebuilt the carb. Around town I never checked.
The new 99 Z71 5.7 285s 3.73 gets 22highway 16town, not much better than the old blazer lol

Southedisto · 06-17-2007, 02:50 PM

I guesstimate mine at 9-10 on the hwy, and 4-5 around town. I have 465-wiht 456's and 37's.

gator2511 · 06-17-2007, 03:52 PM

I was getting 11mpg around town with my 72 4x4, 3:73 rear. With Vortec heads, a mild cam and new dual flowmaster exhaust it has dropped to 8.9mpg. With the sound and performance increase its worth it!

cell · 06-17-2007, 11:43 PM

special-k: that's funny because it's true!

GM72K10 · 06-24-2007, 06:10 AM

72 K10, 350 Auto with working A/C, 3:08 rears, 15" Tires, just drove to Chambersburg and back (about 300 mile round trip to look at M1008s and M1028s) and got 14 mpg.

06-07-2007, 10:23 AM	#1
green724x4 Registered User Join Date: Feb 2007 Location: MI Posts: 214	Mpg? Hey guys, just figured out what mpg is on my 72 is like 8mpg went 105 miles on 13.1 gallons of fuel. What MPG are you getting. Iam running 33"x12.50s I believe 3:73 or 3:08 gears orignal from factory 350 w/th350 Is this about average? Hows your MPG?

06-07-2007, 10:40 AM	#2
1969k10stepside Registered User Join Date: Mar 2006 Location: USA Posts: 21,019	Re: Mpg? 3:73 gears front and rear.350 motor bored .06 over. 825 CFM Holley.Edelbrock Performer intake.Turbo 350.A/C.6" Lift.35" Tires...No gas tank at the moment.Motor still needs a pulley system and distributor,wires, and plugs to run...so I figure about 0 mpg.No tank,non running motor Hopefully I get above 10 mpg when it does run...but I doubt it does.You have to factor in the truck body which is half bondo until I get to working on the body panels again.. Last edited by 1969k10stepside; 06-07-2007 at 10:46 AM.

06-07-2007, 10:56 AM	#3
Mudder Registered User Join Date: Feb 2001 Location: East Central, MO Posts: 11,336	Re: Mpg? I believe I am getting around 10 with a 383 Stroker 4.10's and 35's. Hard to tell when the speedometer is off.

06-07-2007, 11:01 AM	#4
snj8198 Registered User Join Date: Feb 2007 Location: Star Valley, WY Posts: 2,038	Re: Mpg? 496 Edelbrock MPFI, Edel alum oval port heads, Comp 270H 4x4 cam, NV4500/205, 4.11's, 255/85 R16, 13mpg hiway/ 9.5mpg in town. Or 2mpg if i stuff my foot in it! -steve __________________ Steve 1971 GMC Longbox. Full Roller Stroker 489 w/ FiTech EFI, Chris Straub Cam/NV4500/205/D60/14B w. Grizzly Locker and 4.11's. 2" Lift on 33's

06-07-2007, 11:27 AM	#5
Elwayno Registered User Join Date: Mar 2007 Location: Livermore, CA Posts: 34	Re: Mpg? 69 Suburban with stock ?? gears and 31 x 10.5 tires. Four speed with a 205. It did get 16mpg highway before the lift. Not sure now. Gotta remember automatics suck...up a lot of gas anyway.

06-10-2007, 10:50 AM	#6
ericguy320 Registered User Join Date: Jan 2003 Location: Charlotte, NC Posts: 92	Re: Mpg? 72 k5 top off 3.08, 33" tires, sm465, 30 over 350 vortec heads comp cams 4x4 226-234 111 lsa bump stick, road demon 625 carb 93 in the tank. I got 10 mpg when i went to boone last summer all 60mph __________________ http://community.webshots.com/user/ericguy320 1972 Chevy C10 SOLD 1972 k5 blazer cst 350, sm465, rust 1993 gmc Typhoon for sale $13,900 obo 1980 Ironhead Sportster

06-10-2007, 06:28 PM	#7
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: Mpg? I just always guess about 10. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

06-15-2007, 01:00 PM	#8
vegas_k10 Registered User Join Date: May 2007 Location: Las Vegas Posts: 51	Re: Mpg? lol mild 350, sm465 4 spd, 3.73 gears and 38.5's i get about 10-12 around town and less on the interstate.

06-15-2007, 01:46 PM	#9
knsmodels I make Models Join Date: May 2005 Location: Bucks, PA Posts: 626	Re: Mpg? 350/4spd....4:10's with 33 inch tires....can get 12/13 on the highway.....no idea around town.....when it gets near E I just filler up...lol....still better than a new truck payment...... __________________ Click to see what I do 1972 LWB K10 350/4 sp 1968 SS Chevelle 396/tremac5spd

06-15-2007, 02:28 PM	#10
johnnywagon Sofa King. We, Todd, Ed. Join Date: Oct 2006 Location: Spokane, Wa. Posts: 631	Re: Mpg? EIGHT MPG. 37" Swampers w/4.10 gears. Mild 350 w/Q-Jet. Thats w/the top off. Put the super heavy deluxe top back on and.....????? __________________ ~John 71 Blazer One Ton 65 Chevelle Station Wagon x2 59 Belair 2 Door 71 Chevy Open Road Van RV www.myspace.com/johnnywagon

06-15-2007, 03:12 PM	#11
Musclerodz Senior Member Join Date: Aug 2005 Location: OKC, OK Posts: 2,364	Re: Mpg? PO said before he quit driving the K5 he got about 15mpg. That was with a 350/350/205 with 2 barrel carb on 31" tires and 3.73 rear. It now has 400hp LT-1, 4l80e, 205, still 3.73 rear, and getting 33" tires, but not done yet. I am hoping to still get 15mpg or better or I am going to be pissed. Mike __________________ Mike Redpath

06-15-2007, 03:52 PM	#12
vtblazer Registered User Join Date: Oct 2003 Location: Central Vermont Posts: 8,537	Re: Mpg? Never even check it...

06-15-2007, 06:18 PM	#13
RED72blazer urban fourwheelin Join Date: Aug 2002 Location: Seattle Posts: 1,007	Re: Mpg? My best around town is 12, 15 on the highway...but that's driving like a granny. __________________ 1972 K5 Blazer with Cummins 4BT, NV4500 swap in the parts gathering stage.

06-15-2007, 06:49 PM	#14
cell Active Member Join Date: Nov 2005 Location: Austin Posts: 217	Re: Mpg? inline 6 with 1 bbl rochester (permanently jetted rich, unfortunately): about 9 MPG. swapped ring and pinion from 3.73 to 3.08 and noticed a small bump (about 1 MPG).

06-17-2007, 02:04 PM	#16
Fry Registered User Join Date: Dec 2003 Location: Sask, Canada Posts: 169	Re: Mpg? My old 75 blazer on 33s, 4.10s, th350, 305 & 4 bbl got 19mpg highway after I rebuilt the carb. Around town I never checked. The new 99 Z71 5.7 285s 3.73 gets 22highway 16town, not much better than the old blazer lol



Register or Log In To remove these advertisements.

06-17-2007, 02:50 PM	#17
Southedisto River life...... Join Date: Oct 2005 Location: Soldotna AK Posts: 1,078	Re: Mpg? I guesstimate mine at 9-10 on the hwy, and 4-5 around town. I have 465-wiht 456's and 37's. __________________ I like wheelin in Dixie!

06-17-2007, 03:52 PM	#18
gator2511 Registered User Join Date: Mar 2005 Location: tampa florida Posts: 776	Re: Mpg? I was getting 11mpg around town with my 72 4x4, 3:73 rear. With Vortec heads, a mild cam and new dual flowmaster exhaust it has dropped to 8.9mpg. With the sound and performance increase its worth it!

06-17-2007, 11:43 PM	#19
cell Active Member Join Date: Nov 2005 Location: Austin Posts: 217	Re: Mpg? special-k: that's funny because it's true!

06-24-2007, 06:10 AM	#20
GM72K10 Next! Join Date: Jan 2003 Location: Eastern Pa. Posts: 2,483	Re: Mpg? 72 K10, 350 Auto with working A/C, 3:08 rears, 15" Tires, just drove to Chambersburg and back (about 300 mile round trip to look at M1008s and M1028s) and got 14 mpg. __________________ 86 K30 CUCV M1028A1 86 K30 CUCV M1028a2 dually 86 K30 C&C 6.2 4:56s, 4M, 11,000 gvw, ex fire truck, now lowboy dump More square bodies and CUCVs than I care to admit to 2020 Silverado K3500HD Work truck

Register or Log In To remove these advertisements.