MPG on 307? Pretty sure I have to buy this truck. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

GMC406 · 08-17-2009, 07:09 PM

I found this truck for sale close. 900 doallar says it runs but had sat a couple years and needs brake work. Looks pretty clean otherwise, awaiting more details. If it could get decent mileage and is in ok shape it would be awesome to have for a dd. My 406 71 GMC deffinitly wont be DD worthy MPG wise. Plus my current doesnt have PS, PB, or AC and this one does, all with an unbutcherd dash. Something tells me I need it

GMC406 · 08-17-2009, 07:11 PM

oops forgot pics...

JimKshortstep4x4 · 08-17-2009, 07:25 PM

I see the truck comes with spare tires!

My son's 71 307 with AC and 3:07 rear gets 15-16 mpg on the highway.

Jim

OrangeCrush1970 · 08-17-2009, 08:13 PM

Is that a 4 speed granny? I would think you would still be in the neighborhood of 10-12 mpg's. If the price is right then why not? I dont think you'll be finding an economical ride out of any of these v8 trucks though.

big_al_71 · 08-17-2009, 08:16 PM

when my truck had the 307 and 3speed it burned as much gas as my built 406
good luck with it..

nicolas72gmc · 08-17-2009, 09:19 PM

You better get it, it is a GMC!!

I wonder how many times someone got in and out of that truck to wear the seat out like that? lol

**special-K** · 08-17-2009, 10:44 PM

I built a 307 with an RV cam,HEI,1.94 valves and a 450cfm 4bbl in a`71 K/20 4spd with 4.57s and 14.50/37" tires.I got 13 mpg on the hiway.Put a small 4bbl spread bore on it for better mileage.I`d think steady 15 is likely in that truck.

67ChevyRedneck · 08-17-2009, 11:09 PM

Not sure about the mpg's but that's a nice truck!

*ksjh1316* · 08-18-2009, 12:08 AM

Has to be better on the mpg than your current set up. I think I would have hooked up the tow chain and worried about mpg later. Plus it is a GMC you can never have enough 4 eyes

72JimmyDiesel · 08-18-2009, 12:51 AM

I have a 72 SWB 307, 4spd 3.08 truck. With the 307 it would get 14-15 mpg. It ran poor and the timing chain was about to fall off. I did a fresh up on the engine and stuck it in a 47 cj2a. With 5.38's it would get 12mpg. the 307 was replaced with a 6.2l diesel. I average 20mpg now.

08-17-2009, 07:09 PM	#1
GMC406 Professional Grade Join Date: May 2009 Location: Hill City KS Posts: 366	MPG on 307? Pretty sure I have to buy this truck. I found this truck for sale close. 900 doallar says it runs but had sat a couple years and needs brake work. Looks pretty clean otherwise, awaiting more details. If it could get decent mileage and is in ok shape it would be awesome to have for a dd. My 406 71 GMC deffinitly wont be DD worthy MPG wise. Plus my current doesnt have PS, PB, or AC and this one does, all with an unbutcherd dash. Something tells me I need it __________________ 61 GMC 9' Step Someday it will be a build http://67-72chevytrucks.com/vboard/s...=1#post3356828 67 C-30 Red Dale motorhome http://67-72chevytrucks.com/vboard/s...31#post3845531 71 GMC Street performer in the works Waiting for warm weather http://67-72chevytrucks.com/vboard/s...d.php?t=341946 1990 GMC Sierra GT-sold 1983 chevy 4x4-project on hold maybe sell 1969 Triuph GT 6- sold 1996 Ford I-6 5 Speed 4x4 2004 Dodge Intrepid- milage maker 1959 Ford Fairlaine, factory a/c 292Yblock- sold 1982 Honda XL500R Always lookin for other old trucks!

08-17-2009, 07:11 PM	#2
GMC406 Professional Grade Join Date: May 2009 Location: Hill City KS Posts: 366	Re: MPG on 307? Pretty sure I have to buy this truck. oops forgot pics... Attached Images __________________ 61 GMC 9' Step Someday it will be a build http://67-72chevytrucks.com/vboard/s...=1#post3356828 67 C-30 Red Dale motorhome http://67-72chevytrucks.com/vboard/s...31#post3845531 71 GMC Street performer in the works Waiting for warm weather http://67-72chevytrucks.com/vboard/s...d.php?t=341946 1990 GMC Sierra GT-sold 1983 chevy 4x4-project on hold maybe sell 1969 Triuph GT 6- sold 1996 Ford I-6 5 Speed 4x4 2004 Dodge Intrepid- milage maker 1959 Ford Fairlaine, factory a/c 292Yblock- sold 1982 Honda XL500R Always lookin for other old trucks!

08-17-2009, 07:25 PM	#3
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: MPG on 307? Pretty sure I have to buy this truck. I see the truck comes with spare tires! My son's 71 307 with AC and 3:07 rear gets 15-16 mpg on the highway. Jim __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC

08-17-2009, 08:13 PM	#4
OrangeCrush1970 Registered User Join Date: Jun 2007 Location: Smyrna, GA Posts: 709	Re: MPG on 307? Pretty sure I have to buy this truck. Is that a 4 speed granny? I would think you would still be in the neighborhood of 10-12 mpg's. If the price is right then why not? I dont think you'll be finding an economical ride out of any of these v8 trucks though. __________________ *Rottenwood Garage* 1970...71...72 C1500 aka Orange aka Sideshow Bob 540 BB Straub Roller Cam, AFR Magnums, XP 950, TKO 600 2 Tons of Fun

08-17-2009, 08:16 PM	#5
big_al_71 Registered User Join Date: Jun 2008 Location: South Florida Posts: 11,375	Re: MPG on 307? Pretty sure I have to buy this truck. when my truck had the 307 and 3speed it burned as much gas as my built 406 good luck with it.. __________________ Get your facts first, and then you can distort them as much as you please!!!!!. Sylvester's build thread >>>http://67-72chevytrucks.com/vboard/s...ht=big+rebuild

08-17-2009, 09:19 PM	#6
nicolas72gmc Registered User Join Date: Aug 2008 Location: Sunny Arizona Posts: 525	Re: MPG on 307? Pretty sure I have to buy this truck. You better get it, it is a GMC!! I wonder how many times someone got in and out of that truck to wear the seat out like that? lol __________________ Nick "Everyone has a plan, 'till they get punched in the mouth".........Mike Tyson 1968, GMC, SWB, Project 1972, GMC, LWB, Daily Driver, 383, headers, 2.5"/3" exhaust, 200r4, 3.5/5 ECE components. 1972, C/10, LWB, 350 vortec, th350

08-17-2009, 10:44 PM	#7
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,861	Re: MPG on 307? Pretty sure I have to buy this truck. I built a 307 with an RV cam,HEI,1.94 valves and a 450cfm 4bbl in a`71 K/20 4spd with 4.57s and 14.50/37" tires.I got 13 mpg on the hiway.Put a small 4bbl spread bore on it for better mileage.I`d think steady 15 is likely in that truck. __________________ "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 ~

08-17-2009, 11:09 PM	#8
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	Re: MPG on 307? Pretty sure I have to buy this truck. Not sure about the mpg's but that's a nice truck! __________________ Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride American Born, Country by the Grace of God 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications!

08-18-2009, 12:08 AM	#9
ksjh1316 Account Suspended Join Date: Jul 2007 Location: Wichita KS Posts: 1,599	Re: MPG on 307? Pretty sure I have to buy this truck. Has to be better on the mpg than your current set up. I think I would have hooked up the tow chain and worried about mpg later. Plus it is a GMC you can never have enough 4 eyes

08-18-2009, 12:51 AM	#10
72JimmyDiesel Registered User Join Date: Oct 2008 Location: Newberg OR Posts: 14	Re: MPG on 307? Pretty sure I have to buy this truck. I have a 72 SWB 307, 4spd 3.08 truck. With the 307 it would get 14-15 mpg. It ran poor and the timing chain was about to fall off. I did a fresh up on the engine and stuck it in a 47 cj2a. With 5.38's it would get 12mpg. the 307 was replaced with a 6.2l diesel. I average 20mpg now.

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