[NoD~]

Something I have been pondering lately...

Lets say you have a 1.0L engine VS a 2.0L engine. They both use the same technologies, such as fuel injection, cam specs, etc. Lets assume for this comparison that they weigh the same. Efficiency is just about even on these engines.

In another realm, we have different gearing! One is the "performance" gearing and one has long, tall gears for low RPM cruising. Again, weigh the same, efficiency is equal.

So here is the question: If one is to do nothing but P&G with Engine off... is there really going to be any difference in the end result of MPG?

Here's my thoughts on it: If they both consume an equal amount of fuel to produce an equal amount of power and things like idling is thrown out of the equation, should engine size actually matter? And with gearing: As long as you stay in the appropriate RPM range (such as referenced to a BSFC), is there really any point in gearing changes as long as you don't cruise in a set gear?

Of course, in the real world, a 1.0L will probably weigh less than a 2.0L and you will have to occasionally cruise in gear, but I wanted to throw out the variables here and compare to see if drivetrains are really going to make the difference when doing the extreme and P&G+Eoff all the time.

Was just curious on some thoughts on this matter.