Quote:
Originally Posted by serialk11r
Errr...the engine only runs rich near max load and idle. And direct injection reduces the amount of fuel you need because it improves combustion efficiency and reduces cylinder temperature. In addition, the long duration cams reduce pumping loss, and the direct injection makes up for the lack of charge motion due to high lift. If anything, the FA20 should be the more efficient engine at every point.
Anyways, CVT would help in the city, but would hurt on the highway because it has high frictional losses. The manual transmission doesn't have a very tall 6th gear so it won't cruise near max. efficiency, although based on my calculations it should be able to pull a respectable 40+ mpg at 60mph. The auto has very tall 6th gear so it could hit 50mpg. Also you have to remember, rolling resistance is a very small force compared to aerodynamic drag. The Impreza is much bigger dimensionally, and will have more drag.
EPA highway != highway cruise mpg. EPA highway test includes lots of slowing down, speeding up, etc. I dunno about other people, but on the highway I almost never need the brake, and I certainly do not slow down to <45mph very often.
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I didn't know that it was already known that the auto has a taller 6th gear... Wonder how much difference it will make?
I doubt either will get more than 40 mpg... High 30's at best at optimum conditions...