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Old 02-20-2008, 11:47 AM   #3 (permalink)
EcoModding Lurker
Join Date: Feb 2008
Location: SF Bay Area
Posts: 6

Sippy - '07 Toyota Prius Package #6
90 day: 45.58 mpg (US)
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It is interesting reading about the contrasting theories of "increased Hp/efficiency results in better mpg" ie less restrictive intake or exhaust, or the "reduced hp = greater throttle opening req'd which reduces pumping losses and results in better mpg" ie warm air intake.

As noted, some of those intake and exhaust mods only work with old school, non computerized engines. Less restriction on intake or exhaust does not always equal better efficiency on modern computer controlled engines.

Last edited by Winston; 02-21-2008 at 12:22 PM.. Reason: Improve clarity.
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