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What a bummer
I would like to be able to easily get some cost effective fuel efficiency improvement out of lighter wheels...
Most math says forget about it.
Switching to lightweight allow wheels might save 20 lbs off the car, which is 0.5% of a 4000 lb car.
Mass isn't the biggest factor in fuel consumption even when you are talking about the total mass of the car.
Mass normally accounts for 10-30% of fuel consumption.
But I wanna have cool wheels...
Forget it.
Lighter wheels will make your car accelerate faster, brake faster (slightly) and boost fuel efficiency pretty close to zip... unless I'm missing something.
It's sad.
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