Quote:
Originally Posted by bluecamel
There is no way that is accurate. With modern technology, automatic is THE most fuel efficient. So no matter if you use TapShift or drive a manual transmission, there is no way you can drive it so that it is more fuel efficient than automatic. It used to be true that you can get better mpg by driving a manual transmission, but as of about 10 years ago, that is no longer true.
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You do realize the reason the automatic v8 (L99) has 26 fewer horsepower than the manual v8 (LS3) is because Chevy had to modify the engine to avoid the gas guzzler tax, right? If your premise was correct, they could have left the LS3 in and the 'more efficient' automatic would have been fine.
Automatics are a lot closer than back when they were 'slushboxes', but they're not quite there yet.
PS I have an automatic. And I wish you were right so I could have an LS3 rather than L99. But it's just not the case.