does BACK-PRESSURE increase MPG vs straight thru... - Toyota Yaris Forums

marcus · 04-28-2009, 01:32 PM

got it thanks..it does make sense...its just there is a theory that back pressure allows the engine to reuse unburn fumes that stays on the enginedue to backpressure.to get a better gas mileage..???

Quote:

Originally Posted by at3GG

meaning if your exhaust gives you 5hp but you drive it exactly the same as before, theoretically your mpg should increase because you have more power pulling the same weight. However, most of us like to use the extra power that we get so it will basically cancel out any mpg gain. Think thats what he meant basically?

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