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Originally Posted by ElanC
Not what I'd expect. As noted, I think it would be half as much at best. And if you're getting spoked wheels instead of those plain looking flat disc covers, you'll lose at least some of the gain to air friction. And if the new tires aren't low roll resistance I'll bet that overall your FE will drop a bit.
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Sorry - I misread you original post. However, I don't see how dopping more than 14 lbs off the wheels could do anything but increase FE. The tires, for those that are interested, are Continental ContiTouringContact CV95, which are one of the GreanSeal's low rolling resistance tires. In fact, they're one of the best on the list (actualy the CH95 is on the list - CV is just "V" rated version and takes 51 psi, weighs 18.3 lbs).
There are many other collateral benefits to lowering wheel weight. Better braking, accelleration, reduced strain on the suspension. I can't see that at the speeds I drive (40-55
MPH) spoked vs. flat would make any difference - no more than the 6 holes in the stock wheel currently do.
I'll have all this installed in about 2 weeks. I'll be sure to report back after the first tank.