They sure can. I'd guess that in the near-future, we'll see smaller, FI motors with various fuel-saving tech on them (like AFM)...even the Eaton TVS supercharger units are able to provide a 2-3mpg bump in fuel economy...
GM can do anything they want (look at HCCI: a diesel-cycle GAS engine?!?)...they just need the money...:(
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"Keep the faith." - Fbodfather
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