I find it also pays to get into top gear as soon as possible so you can get in early on the mpg savings from the gear lowered rpm.
My car will idle along in 5th gear without throttle at about 27mph 950rpm up gradual grades without issue, at idle. I think or expect this to be its top mpg cruising speed as it using the least fuel possible.
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Save gas
Ride a Mtn bike for errands exercise entertainment and outright fun
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