Get yourself a good vacuum gage and don't leave it in the package. INSTALL
IT. Then watch it. When it registers below 7 inches of vacuum, lift up on
the gas pedal, and manually downshift into second gear. Then proceed at 10
to 12 inches of vacuum until you crest the hill. Then, up shift to 3rd. It
will improve your fuel economy and make your engine last longer. You will
have a bit more time to enjoy the view out the windshield, too.
Jim Hupy
Salem, Or

On Jan 17, 2018 2:42 PM, "Vadim Jitkov" wrote:

Keith V wrote on Thu, 21 September 2017 08:33
> ...What do you do on hills to get an average of 8-9?


Looking back at some older discussions, I noticed that this one did not
generate any replies. I have the same question as Keith V - what is the best
way to drive our GMC in the areas with lots of hills?
--
Vadim Jitkov
'76 Glenbrook 26'
Pullman, WA

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