Putting in the aluminum flywheel has had a great unintended bonus. My mileage is way up! In stock configuration on California gas (now 91 octane) I used to get around 300 miles per tank of gas, maybe as much as 320 if just freeway driving without traffic jams, as low as 290 with heavier commute use. With the lighter flywheel in mixed city/freeway driving, I'm now getting 350 miles to the tank! With all the driving I do, I frequently fill up twice a week. That's like an extra 4 gallons of gas, and at close to $2/gallon, that means the flywheel will pay for itself within the year. Whoopee!

As for the JWT clutch (stage 1) so far I like how it holds ...

 

I was thinking about getting a lightened flywheel from Unorthodox Racing, but I heard using the flywheel in conjunction with the UDP is not a good idea. I don't know why that is, but I don't want any negative effects. I also was informed of a $350 shipped group deal a while back on the groupbuycenter.com...the only thing is the guy needs 10 orders. Oh yeah, getting better mileage has always been a quest of mine. I rejoice in others improvements also.

 

I hadn't heard there were problems using the UDP with the lightened flywheel. I have both. I have noticed an occasional small stumble at low rpm during moderate acceleration, but once I became aware of it, it became hard to duplicate. Hence it could have been a greater sensitivity of the motor to my foot.