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Old 06-22-2009, 12:27 PM   #22 (permalink)
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Location: Bay Area, CA
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Honduh Power - '98 Honda Civic HX
90 day: 44.37 mpg (US)
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ok ok ok ok.

You make a good argument, although you assume it will be run continuously, and you do not account for the decreased amount of time spent out of closed loop on cold start, as well as time spent in and out of lean burn.

It also happens that using exhaust heat requires the length of the intake tract outside of the tb to almost double. Isnt that a considerable amount of restriction?
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