Quote:
Originally Posted by brucepick
Probably is geared low for higher engine rpms and has wide tires, both of which will cost you mpg.
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the Si has a pretty good torque curve, and the Manual trans (6 Speed?) is geared low for the low gear but usually has a pretty good top end gearing. one of my friends has an '07 Civic Si that has a 6 speed that works great for hypermiling, i've driven it quite a few times and after a little practice perfected shifting 1-3-5-6 which it had no problem with due to the torque the engine produced. Wider tires aren't always bad (as long as they aren't 275's like Porsche put's on their carrera's) as the wider contact patch lowers rolling resistance, but you have to find the "sweet spot" that works the best, if there is a minimal amount of tire exposure as far as frontal area goes than there isn't a significant problem (but on my Jeep wider tires would destroy mileage because a good portion of the tire is exposed as frontal area)