Re: Summit - V8 Hemi - Fuel choice
But you say it can improve performance. Well, increased fuel economy is one possible byproduct of improved performance, right?
The article you link to says:
"One exception is with engines or cars designed for high octane gas. In that case, using high octane gas WILL improve performance and mileage. The reason has to do with the compression and ignition timing characteristics of the engine. Those specially designed engines will only perform efficiently with higher octane gas. Most engines are not designed this way."
The question this raises is: has the Hemi in its current configuration been designed for higher octane gas? Since the manual recommends mid-grade, the answer might be yes. It might perform more efficiently on mid-grade, which would equate to a combination of better acceleration and/or better mpg's.
I think that from the sound of most comments, the improvement on mid-grade is probably a rather small one, though.