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Old 04-04-2022, 07:58 PM   #59 (permalink)
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Join Date: May 2019
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2020 - '08 Chevy Tahoe H
Last 3: 18.4 mpg (US)

2021 - '08 Chevy Tahoe H
90 day: 17.08 mpg (US)

2022 - '08 chevy Tahoe LT
Last 3: 14.38 mpg (US)

2023 - '08 Chevy Tahoe
Last 3: 22.61 mpg (US)

2024 - '08 Chevy Tahoe
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Originally Posted by MetroMPG View Post

The last CVT I spent much time driving was the 1.2L, 3-cylinder Mirage pictured above.

I was genuinely impressed by how much it was programmed to pursue fuel economy: It tries its little heart out to keep cruising revs as low as possible (see chart).

I remembered being pleasantly surprised that...

That has me wondering: do CVT's programmed for such low RPM, fuel-saving operation offer fewer chances for zero fuel burn (DFCO) when releasing the throttle and coasting in gear? Seems possible you might only get a brief fuel cut before injection resumed to keep the engine running.

Other types of transmissions would have the engine at a higher RPM for a given road speed at the start of coasting. So, more time in fuel cut-off mode.

If that's the case, a CVT hypermiler might benefit from more neutral coasting.

Splitting hairs? Probably! These are the things that keep me awake at night.
i got a EVT transmission DFCO is a neutral like coasting No engine breaking the rpm goes to 1,000 too
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