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The thing GM needs to consider also is type of gas. Most if not all DI or FI engines require premium fuel. If they have a V-6 at 250hp and a FI 4 at 260 (even with tunability of a turbo engine) most will opt for the 6 since it can run on 87 octane and not 91/93.
Another thing to consider is that they would broaden their audience by adding a turbo 4 to the options list. Look at what can be done with the 2.5l boxer from Subaru or the 4G63 (now 4B11) from Mitsubishi, easily 300hp with a lighter engine than a 6 or 8.
While they need to meet CAFÉ they can do it with other cars as well, volt, other hybrids, smaller cars, diesels. Every single car in the lineup doesn’t need to hit 35mpg. Of course having a lineup that’s not bloated with Trucks and SUV’s would help.
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