If you're not scared to do things once you're off warranty, you can do much better with an auto than you might think. My 05 Malibu LS exceeds most mild hybrids. Just put a belly pan and use synthetics and don't add junk to impair the aerodynamics. Don't use ethanol blended fuel. Totally agree with final drive ratio - mine's 3:05:1 on a four speed 4t45e with v6. Some of the big old Buicks had that tall 2.68:1 for highway cruising too.
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