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Old 09-19-2013, 03:15 PM   #12 (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: 26.89 mpg (US)

Felicia - '09 Toyota Prius Base
90 day: 51.67 mpg (US)
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Fuel cutoff solenoid prevents pulling unnecessary fuel through the lines during key-off engine revs. I don't know how old your carbureted car would have to be to lack a cutoff solenoid; I think Toyotas had it in the 70s.

But it makes a huge difference to let it run down to idle and run there for a second or two before keying off. Turning off while still at high revs pulls too much fuel through unburned, and it almost guarantees a nasty backfire at the next key-on. And if you look back through my history, you can see where a backfire blew my (admittedly cheap) muffler wide open. So I spare a few milliliters of fuel to prevent that. It's worth it.
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