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Originally Posted by 95metro
Plus it does nothing for you since you already have the "free" transmission. It's a lot of work for an "experiment" isn't it?
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Well, there's no doubting it would help my overall mileage. The only experimental question is whether it would hurt the car's driveablility so much that I wouldn't like it. That's why I would just try the oversized wheels/tires if I had access to some that would fit.
Assuming I was OK with the driveability, I would still switch back to the smaller wheels and tires and do the swap because of the aero, LRR, and rotating mass advantages of the OEM tires/wheels setup (assuming the bigger wheels/tires combo is heavier).
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I have read a few posts talking about rotational weight and how important it is to keep that to a minimum. What is that all about and how much effect will what I am doing have in that respect?
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Rotational (ie. drive train) mass takes much more energy to accelerate and brake than other vehicle mass - 7 times as much, if you believe this page:
http://www.my330i.com/mod19.php - So reducing rotational mass will particularly help if your driving is not primarily steady speed.