2017 GMC 6.0 Vortec - Manual Shifting?
I notice when I am towing my RV, my truck seems to try and down shift sometimes when climbing a hill before it should. Do any of you guys manually shift to get more power or save gas in these situalt...
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Ok, I'm not sure what you mean by "before it should." Maybe you misspoke?
If indeed you meant before, lugging the engine is bad for efficiency. You will use far more gas letting the engine lug down before shifting, than letting the transmission shift and the engine rev up. The engine has a range of RPMs where power and efficiency are optimum, and modern automatic transmissions are designed to keep the engines in that range.
Lots of discussion lately in towing threads about downshifting and letting the engine rev, and many people claim they get BETTER fuel economy by doing that than forcing the engine to lug down.
If indeed you meant before, lugging the engine is bad for efficiency. You will use far more gas letting the engine lug down before shifting, than letting the transmission shift and the engine rev up. The engine has a range of RPMs where power and efficiency are optimum, and modern automatic transmissions are designed to keep the engines in that range.
Lots of discussion lately in towing threads about downshifting and letting the engine rev, and many people claim they get BETTER fuel economy by doing that than forcing the engine to lug down.
