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03-27-2012, 03:48 PM
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#1 |
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Registered User
Join Date: Feb 2012
Location: So. Cali.
Posts: 2,621
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Fuel Mileage Check '69 C/10
I was cleaning out the glovebox after my recent two day Desert Road Rally and found the gas tickets from last August when I initially bought this truck in Dallas TEXAS and drove it home to L.A. ~
I also had the stack of gas receipts from that Road Rally so I figured them all up . It has consistently achieved 14 ~ 16.7 MPG's , a very few tanks have come in at 17. + MPG . All in all I'm highly pleased . __________________
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-Nate Geezer '49 3100 235 W/ Muncie SM420 SOLD '69 C/10 shortbed sidemount survivor 250 L6 W/ 350TH 
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03-27-2012, 03:55 PM
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#2 |
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Registered User
 
Join Date: Oct 2010
Location: Portland, or
Posts: 387
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Re: Fuel Mileage Check '69 C/10
Whats under the hood
Engine Carb Tire size Axle ratio Trans Posted via Mobile Device
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Chuck 
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03-27-2012, 04:12 PM
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#3 |
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Registered User
Join Date: May 2011
Location: Northern Calif.
Posts: 3,642
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Re: Fuel Mileage Check '69 C/10
I'd have a giant smile if I got 14mpg outta mine!
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03-27-2012, 04:44 PM
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#4 |
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Registered User
Join Date: Feb 2012
Location: So. Cali.
Posts: 2,621
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Re : Oops !
Whats under the hood
Engine : 250 C.I.D. L6 with new bottom end and seriously wobbly valve guides . Carb : original Rochester MV Series Monojet 1BBL . Tire size : LT235R15 Falkens , 28" O.D , I wish thy were larger diameter by my son insisted I try these Falkens and they're great . Axle ratio : Unk. ~ I need to pop the cover off and see . Trans : Turbo - Hydromatic 350 . Ignition upgraded to Delco HEI from a '77 Nova 250 but the mileage remains the same ~ it just runs a whole lot better .
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-Nate Geezer '49 3100 235 W/ Muncie SM420 SOLD '69 C/10 shortbed sidemount survivor 250 L6 W/ 350TH
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03-27-2012, 04:46 PM
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#5 |
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Registered User
Join Date: Jan 2012
Location: BOWLING GREEN
Posts: 69
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Re: Fuel Mileage Check '69 C/10
70 GMC 350, TH350 lwb
I just calculated mine at 10mpg |
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03-27-2012, 09:34 PM
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#6 |
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Who's got steelies?
Join Date: Feb 2006
Location: Morrison, Oklahoma
Posts: 1,026
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Re: Fuel Mileage Check '69 C/10
Getting a pretty consistent 15 with my rebuilt 305.
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1969 C10 LWB W/ 250 I6 & 3spd1970 C10 with '67 small window cab, 68 front end, blue; 305/TH350, 3.08 limited slip rear end, manual brakes, power steering; & 4-wheel drums-My daily driver.1975 Chevelle Malibu Classic Coupe 350/th350 mint green1970 C20 Suburban 350/700R4 4.10 gearing green & white 1978 Big 10 Silverado 350/th350, working ac, 2 tone blue-My summer daily driver 1983 GMC 1500 Sierra 305/SM465 2.73 rear end How to add a trip odometer to your 67-72 stock speedometer How to rebuild your Q-Jet My Truck Page My Youtube Channel |
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03-27-2012, 10:10 PM
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#7 |
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Registered User
Join Date: Oct 2006
Location: denver nc
Posts: 97
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Re: Fuel Mileage Check '69 C/10
10.8 with 350. I had a 305 in it and got 14.6. Guess I should have rebuilt it.
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70 CST Bunch of old Camaros 
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03-27-2012, 10:31 PM
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#8 |
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Registered User
Join Date: Jul 2011
Location: vacaville ca
Posts: 1,304
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Re: Fuel Mileage Check '69 C/10
man I wish, 7 in my mild built 350...... sucks
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04 CHEVY LLY LS DURAMAX 4WD. MODS TO FOLLOW, EFI LIVE, BUILT TRANS, LBZ MP, LIFT PUMP SOLD 1972 chevy c10 |
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03-27-2012, 11:03 PM
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#9 |
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70+ ( Old Skool Club )
Join Date: Nov 2003
Location: Saskatoon, Saskatchewan ,Canada
Posts: 9,104
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Re: Fuel Mileage Check '69 C/10
I just started driving my 1969 3 on the tree with overdrive ( although I haven't used the O/D yet) 307 2bbl around the city and the gas gauge is not going down as fast as the one in my 396/TH400 72 truck.
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1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021 Last edited by Already Gone; 03-27-2012 at 11:48 PM. |
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03-28-2012, 01:00 AM
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#10 |
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Senior Member
Join Date: Aug 2011
Location: Reno, Nv.
Posts: 1,430
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Re: Fuel Mileage Check '69 C/10
Since I purchased last February, I get 14.2-14.9. Towed 14' dump trailer full of manure and it dropped to 11.8. Odometer may be off a little due to tire size. 350/350 with 4:10 gears.
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1927 Willy's Knight 24,000 original miles, 1958 Impala 283/Powerglide, 1964 C-30 383/4 speed, 1971 Monte Carlo 350/350, 1972 GMC K2500 350/350, 1976 Chev. K10 350/350, 2006 GMC Sierra 2500HD LBZ Duramax/Allison, 2006 Chev. Silverado K3500 LBZ Duramax/Allison |
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03-28-2012, 09:27 AM
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#11 |
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Registered User
Join Date: Feb 2012
Location: So. Cali.
Posts: 2,621
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Re: Fuel Mileage Check '69 C/10
These are all pretty good numbers ~ I hope folks will continue to keep posting them up .
I was always deliriously happy whenever my old '49 3100 with 235 , Muncie SM420 and 3.55 final drive , 32" tires , got up to 12 MPG.... I hope my new tranny will improve the fuel economy a bit . I can hear the rear end sing @ Highway speeds so I might be swapping it out soon , anyone know if a 3/4 ton (C/20 rear end will bolt in ? . springs etc. all the same ? . TIA ,
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-Nate Geezer '49 3100 235 W/ Muncie SM420 SOLD '69 C/10 shortbed sidemount survivor 250 L6 W/ 350TH
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03-28-2012, 08:11 PM
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#12 |
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Registered User
Join Date: Jun 2009
Location: Forest City IA
Posts: 56
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Re: Fuel Mileage Check '69 C/10
12 city and 15 highway with a 250 4 speed C-20. Highway speed is limited to 60-65 and I would like to swap the 5:13 gears for 4:11's
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04-20-2015, 01:40 PM
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#13 |
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Registered User
Join Date: May 2013
Location: Catawba Island, OH
Posts: 203
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Re: Fuel Mileage Check '69 C/10
70 C20, 350, TH350, Qjet, 10MPG....Burdon or not.
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04-20-2015, 01:45 PM
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#14 |
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Registered User
Join Date: Feb 2012
Location: Smyrna TN
Posts: 1,153
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Re: Fuel Mileage Check '69 C/10
Consistent 10MPG. 402 .30 over with Comp 268 cam, Turbo 400, 3.08 open rear end with 20" tires and wheels. If I pushed it down Mount Everest with the engine not running I might get 15MPG:-)
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1971 Longbed BB Cheyenne Super 1972 Longbed SB Cheyenne Super 1972 Longbed Highlander Custom Deluxe 1975 K5 4x4 full convertible Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=645165 Greg Smyrna TN |
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04-20-2015, 01:45 PM
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#15 | |
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Registered User
Join Date: Jun 2013
Location: West Virginia
Posts: 6,421
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Re: Re : Oops !
Quote:
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04-20-2015, 01:46 PM
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#16 | |
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Registered User
Join Date: Jun 2013
Location: West Virginia
Posts: 6,421
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Re: Fuel Mileage Check '69 C/10
Quote:
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04-20-2015, 01:57 PM
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#17 |
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Registered User
Join Date: Sep 2014
Location: Gloucester Massachusetts
Posts: 72
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Re: Fuel Mileage Check '69 C/10
I usually get in the 12-16 range in '70 with a 402 and a three on the tree.
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04-20-2015, 02:57 PM
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#18 |
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Registered User
Join Date: May 2011
Location: concord nc
Posts: 7
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Re: Fuel Mileage Check '69 C/10
I would like to know more about the 3OTT with overdrive
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