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Old 09-09-2018, 09:23 PM   #8 (permalink)
elhigh
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Join Date: Jan 2008
Location: SE USA - East Tennessee
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Josie - '87 Toyota Pickup
90 day: 29.72 mpg (US)

Felicia - '09 Toyota Prius Base
90 day: 51.33 mpg (US)
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Determining what's more efficient is a tough call but you'll be able to figure it out once you've hooked up the adapter and fired up the app. Torque Pro has a fuel rate setting; whichever is lowest (set your gear, set your cruise control, then run your test route again in the other gearing but without resetting the cruise control) is your winner.

I am going to take an educated guess and say 3rd/locked is your better bet. It's 1.00/1 so straight through, no or less gearing losses, and no TC losses. I think a lower duty cycle on the injectors will make up for the higher engine speed.
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