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05-29-2013, 12:40 AM
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#1 |
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Registered User
Join Date: Aug 2010
Location: White City, SK
Posts: 411
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Re: gas mileage
I've got a dually with a 454, 4.10's and a 700r4. Don't expect big mileage gains. The big benefit is a much quieter truck on the highway; it loafs along at 70-80 now.
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05-29-2013, 12:55 AM
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#2 | |
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Registered User
Join Date: Sep 2009
Location: Beaverton, OR from WA State
Posts: 1,515
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Re: gas mileage
Quote:
__________________
Devin 1983 GMC High Sierra 2500, 4x4, RC/LB, 400 S.B., SM-465, NP-208, Corporate 10 bolt & 9.5" 14 bolt 1996 GMC Sierra SLE 3500 DRW, 4x4, EC/LB, Vortec 454, NV-4500, BW-4401, AAM 925 & AAM 1050 1997 GMC Sierra SLT 1500 4x4, Z71/F44, EC/SB, Vortec 350 My Introduction with my '83s History New Daily, the '96 |
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05-29-2013, 01:00 AM
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#3 | |
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Registered User
Join Date: Feb 2012
Location: Big Valley. Alberta
Posts: 674
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Re: gas mileage
Quote:
Posted via Mobile Device
__________________
1977 Chev C30 454/465/14ff DRW 1974 Chev C20.350/465/14ff " Rock n Roll ain't noise pollution" 
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05-29-2013, 01:06 AM
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#4 |
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Registered User
Join Date: Aug 2010
Location: White City, SK
Posts: 411
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Re: gas mileage
I don't want to highjack the thread, but yes, it's got a1980 front end and it's a '77 from the cab back. You've got sharp eyes.
Posted via Mobile Device |
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05-29-2013, 01:35 AM
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#5 | |
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Registered User
Join Date: Jul 2012
Location: United States
Posts: 268
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Re: gas mileage
Quote:
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86' C30 Dually Crew Cab Ranch truck, carb'd 454, TH400, towing a slant load 4 horse trailer. |
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05-29-2013, 07:53 AM
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#6 |
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Registered User
Join Date: Jul 2007
Location: Tucson, AZ
Posts: 3,198
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Re: gas mileage
I had a 73 C20 454/400 and currently have an 83 C20 454/SM465 (both regular cab long beds) and do only city driving. I got 11 mpg best in city only driving on the 73, and get 9-10 mpg city only driving with the 83 (I attribute that to the smog equipment on the 83. The best highway mpg I got with the 83, even using the gear vendor, was 13 mpg.
If there are secrets to better gas mileage I would sure like to know what they are. I can't remove emissions equipment because I live in a emissions required part of Arizona. In city driving, I spend more time stopped and idling at intersections than driving. |
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12-03-2013, 09:38 PM
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#7 |
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Registered User
Join Date: Jun 2009
Location: san francisco, ca (east bay)
Posts: 674
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Re: gas mileage
I would also like to know the secrets. Too bad that dude did not follow up.
My '75 Gentleman Jim gets 9-11mpg, and that's mostly highway driving the speed limit (65 or less). 350/350 This thing needs a tune and burns a little oil. I imagine I might be able to do a tad better. My 84' 305/700R4 got 21 @ 65mph highway until the tranny went south. Then it never got above 17mpg. But it was a dog. I like my 75 350 better, even with the crappy mileage. Would better heads help? |
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