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06-03-2010, 10:15 PM
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#1 |
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Registered User
Join Date: Mar 2010
Location: Hydro, OK
Posts: 89
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305
'85 high sierra is getting 11.9 MPG after carb rebuild. Sure thought that little motor would do better than that.
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06-03-2010, 10:23 PM
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#2 |
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Registered User
Join Date: May 2007
Location: East Haven, CT
Posts: 882
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Re: 305
What gears are you running? What transmission? What size tires Those three play a big role in gas mileage.
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87 Chevy 2wd SWB: 305/700r4 Dual Exhaust, K&N Filter, Injector Pod Spacer, TBI Spacer, Belltech Front Sway Bar, Corvette Servo, Western Chassis 4/6 and c-notch |
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06-03-2010, 10:40 PM
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#3 |
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Registered User
Join Date: Mar 2009
Location: TN
Posts: 410
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Re: 305
Pretty much the same as I was getting. '85 C-10, 305, rebuilt QuadraJunk, 350 turbo, 2.73 gears... Gas mileage and these trucks don't mix. I don't know why so many people are suprised their mileage isn't good.
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'69 Dodge Charger R/T 440, 727, 3.55 Sure Grip '68 Plymouth Road Runner 383, 727, 3.23 Sure Grip '89 Dodge Diplomat ex cop car 408, 727, 3.55 Sure Grip '77 Dodge Monaco ex cop car 440, 727, 2.71 '79 Dodge 'Lil Red Express pickup 360, 727, 3.55 Sure Grip '12 Dodge Challenger SRT8 392, M6, 3.92 '85 Chevrolet C-10 SWB 2wd 305, TH350, 2.73 |
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06-04-2010, 08:12 AM
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#4 |
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Registered User
Join Date: Mar 2010
Location: Hydro, OK
Posts: 89
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Re: 305
700R4 tranny with 235/15 tires.
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06-04-2010, 09:38 AM
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#5 |
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Registered User
Join Date: Oct 2002
Location: Edmond, OK
Posts: 5,906
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Re: 305
My 87 GMC had a TBI 305 with the 700R4 and 235s and it would get 16mpg if I was easy on it. For a carb'd motor and depending on your driving style almost 12 mpg sounds average.
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Jon 1982 Chevy Silverado 350/th350.... RETIRED 1993 Jeep XJ 2 door(Cherokee) 4wd 4.0ltr/AX-15 (5spd)/NP231 .... Oklahoma Roll Call |
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06-04-2010, 10:16 AM
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#6 |
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Registered User
Join Date: May 2007
Location: East Haven, CT
Posts: 882
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Re: 305
Unfortunately that pretty much is the norm. You are running atleast an OD transmission and stock tires. What gears? If you are running something like a 2.73 and all you do is stop and go city driving, that would hurt mileage.
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87 Chevy 2wd SWB: 305/700r4 Dual Exhaust, K&N Filter, Injector Pod Spacer, TBI Spacer, Belltech Front Sway Bar, Corvette Servo, Western Chassis 4/6 and c-notch |
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06-04-2010, 12:15 PM
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#7 |
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Registered User
Join Date: Jun 2007
Location: Cape Coral, Florida
Posts: 1,123
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Re: 305
My 86 swb with a carb'd 305/700R4 2.73 rear on 275/60R15 tires gets 17mpg mix of city and highway. Only mod is a catback flowmaster. I don't go to easy on the gas either.
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06-04-2010, 12:42 PM
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#8 |
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Always a work in progress
Join Date: Jun 2007
Location: Harker Heights, TX
Posts: 1,599
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Re: 305
I get 13mpg with a mix of around town and highway. Holley carb, performer intake, headers, flowmasters, and i don't go easy on it.
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USMC Retired Never trust a man who can't laugh at his own fart! 2010 Silverado Crew Cab 73 SWB 5.3/4l80e Build Thread: http://67-72chevytrucks.com/vboard/s...d.php?t=695168 Last edited by softballnrd27; 06-04-2010 at 12:42 PM. |
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