[GMCnet] 4.8 MPG [message #324190] |
Fri, 22 September 2017 09:59 |
glwgmc
Messages: 1014 Registered: June 2004
Karma: 10
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Interesting observation about finding better hill climbing ability running slightly richer, Justin. Maybe that is why I always felt the S and J engines in our Clasco and Royale made for wonderful driving machines for scampering around the west where mountains are a part of every trip. As I reported several times after returning from long adventures we rarely needed to downshift even on long grades yet I never allowed the engines to go to WOT (kept vacuum above 4") and didn't allow speed to drop below 45 mph.
Jerry Work
The Dovetail Joint
Fine furniture designed & hand crafted
in the 1907 former Masonic Temple building
in historic Kerby, OR
http://jerrywork.com
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Jerry & Sharon Work
78 Royale
Kerby, OR
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Re: [GMCnet] 4.8 MPG [message #324212 is a reply to message #324208] |
Fri, 22 September 2017 14:18 |
Jerry Wheeler
Messages: 246 Registered: January 2013
Karma: 2
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The old sage said "8 to 10 depending on whether you tow or not". None
other than Gene Fisher...........
JR Wheeler 78 Royale NC/OR
On Fri, Sep 22, 2017 at 2:31 PM, Gary Worobec wrote:
> I can;t recall who it is but some old sage on this list when asked how
> many mpg you should get with a GMC always answers “8 to 10 mpg”. Over the
> dozen or so years we have had our coach he is right on. No matter what you
> use, a carb or FI, what distributor you have, headers or no headers, a a 23
> or a 26, towing or not towing it always is between “8 to 10”.
>
>
>> On Sep 22, 2017, at 8:51 AM, Justin Brady wrote:
>>
>> Yep that's what I found.
>> I only had to downshift once after richening it up a bit and that was a
> crazy grade.
>> Mileage suffers a bit but totally worth it in the mountains imho
>> --
>> Justin Brady
>> http://www.thegmcrv.com/
>> 1976 Palm Beach 455
>>
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>
> Gary Worobec
> gtw5@earthlink.net
> 1973 23 GMC Glacier
> Howell EFI/EBL
>
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