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06-07-2012, 10:25 AM
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I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,992
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Re: Decreasing carb size to increase gas mileage?
I would think MPG would be better with the 600 or a 625.Theory(yeh right) is that driveability is better with a vac secondary of smaller CFM due to better vac signal to the carb.If you keep your foot out of it and drive mostly city the secondaries shouldn't open very often as long as the engine is getting the fuel/air it needs.Unfortunately with the specifics of any given vehicle/engine etc.combo you can only go by past experience to determine what to try.That can get more expensive than the fuel to continue with the MPG you currently have.
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