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      04-16-2011, 05:10 PM   #26
sneaks
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Drives: '08 335xi
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a vehicle needs a certain amount of energy to obtain the necessary motive power regardless of the size of engine. So switching an engine in an average or underpowered car with a smaller displacement FI with equal output won't create much increase in economy.
It is the huge engines in the cars like an M5 that will see the largest benefit. This new m5 is a turbo like it or not and is a gross improvement in fuel economy and power.

There is a fuel savings in this new 4 cylinder, but it isn't great. Economy cars get better mileage because of their weight.
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