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It's certainly good enough to avoid the guzzler tax, but getting a vehicle, especially something with a manual trans that's as small/low drag as a vette, to do better than 30mpg@55mph ain't too hard either. I'm hesitant to say it could be done w/ gearing alone, but it ain't like cylinder deactivation is anything new. It's just that people who are paying fifty grand and up for a sports car couldn't car less even if it could pull ~40-50mpg@60mph. All that's needed is a tall enough sixth, and a gear lockout in order to avoid the ~$8k ($10k?) guzzler tax.
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