Quote:
Originally Posted by NoD~
Now, to be perfectly clear: This is a theoretical, on paper idea. I realize that there's a billion other variables to this equation.
That said, the thought process here is, in real world ideology, to compare in regards to the idea of, say, an engine swap to a different engine or changing out transmission for different gear ratios, all while still using the rest of the car. Even then, there's obviously variables...
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Plain and simple a smaller engine will always get better fuel economy if it is of equal efficiency as compared to a larger one.
Unless the small motor has terrible gears and poor fuel delivery there is just no comparison.
That is why the mother earth 40mpg full size trucks do so with their 5hp - 25hp engines.
Obviously drivability is removed but fuel economy is great.
This is of coarse removing P&G and obviously removing what happens if the motor is so small that you run it at redline to maintain 55mph