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Well, my car has the 4T45E transaxle(still despise it's being an automatic but no manual was offered on this car) with the 3.63 final drive ratio, and I turn around 2600 at an indicated 80mph... Other final drives were offered (the 4T45 behind the 3.5V6 was 3.08, and the Malibu Maxx had like a 3.23 ratio to compensate for weight), but I don't know how well my L61 (2.2 L4)PCM would play with a taller transmission... Not that it has power to turn taller gears anyway... The main issues with getting great highway mpg is the interstate on which I do much of my highway driving(most of it is two lane at 55-60mph), it has lots of 5 and 6% grades, on which the engine struggles, and the trans kicks down, and then I'm turning 4000+RPM getting an instant reading of about 12... Figuring out how to get the trans to stay in OD and still maintain speed is just a matter of reducing resistances(drag, rolling resistance, weight), but I'm just getting started...
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