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Idle is typically 14 to 15 inches of Mercury.
Driving on the highway you can see up to 21 inches of mercury.
My friend has a 4 cylinder Tacoma, when he goes up hills he leaves it in top gear as long as possible. Very low vacuum show much better mpg on the scan gauge then shifting it in a lower numbered gear, more RPMs and more manifold vacuum like you tend to get with an auto transmission.
Ideally you would have a 1L engine and something like a 7 or 8 speed manual transmission and put it in the highest gear you can maintain speed and hold the gas on the floor.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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