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Coasting in my VX and Echo.
Pulse at 25 MPG.
Glide at 50 MPH while the engine is idling (EOC would be better but it is labor intensive and accelerates wear on components).
Echo at .19 GPH at idle, 50/.19=263 MPG
VX at .15 GPH at idle, 50/.15=333 MPG
Engine off is infinite MPG.
I tried a tank in the Echo using EOC. The mileage went from 53 to 56 MPG for that tank.
If I wanted to shut off and bump start several hundred times for every tank of fuel, then I could get 3 more MPG.
If there were more significant grades here or my average speeds were lower than 35-38 MPH then the difference would be greater.
In the VX shutting the engine off means you lose Lean burn for over 30 seconds on the restart. Extreme engine off coasting can also cause your 02 sensor to go out of closed loop and in even more severe cases your engine can cool off to the point where warm up fuel enrichment becomes an issue.
regards
Mech
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