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blackjackel -
Here is a total guestimate. First I would estimate the "on average" loaded weight of the car, and use this equation to express an inverse proportion relationship :
old weight X / new weight Y = new MPG ? / old MPG Z
Isolating for new MPG ? leads to this modified equation :
new MPG ? = ((old weight X) * (old MPG Z)) / new weight Y
Now let's plug in example numbers :
old weight X = 2800 lbs
new weight Y = 2800 - 44 = 2756 lbs
old MPG Z = 36
new MPG = (2800 * 36) / 2756 = 36.57 MPG => +0.57 MPG
But, this is all speculation on my part. Also, changing the weight of the wheels is a special weight change because it modifies the load on the engine. This sounds like a great tuner question. I think there are very pricey wheels out there that are light and strong for just this reason. I would look in the Sport Compact Car magazines to see what is offered for your Corolla.
CarloSW2
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