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Old 04-03-2013, 09:24 AM
BogiesAnnex1 BogiesAnnex1 is offline
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Originally Posted by xzero117 View Post
on a car equipped with a double pumper carb settup

is it better to drive around at say 2000rpm in third gear at 30mph with the gas pedal pressed down 25% of the way

or to drive around at 1200 rpm in 4th gear at 30 mph with the gas pedal pressed down 50% of the way ?

in which scenario would I achieve the best mpg's

it's always recommended to stay in as high a gear as possible for fuel economy, but does that still apply if you're dogging it ?
More RPM on less throttle in this case. It does two things, it keeps the air velocity up in the primaries which meters better; it keeps the manifod vacuum up preventing the power valve from coming on.

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