My normal commute is 5.5 miles and 22 stop lights. I'm getting good at timing the lights but I'm still start/stop/start/stop. For me the lightweight flywheel would help (once I got good at driving it). If your vehicle is more often driving open highway then it won't help as much. I take energy to start the flywheel spinning every EOC/Bump start I do. Open highway then you've got the flywheel to speed once and you are not accelerating/decelerating every 3 times every mile.
Last weekend I took a grinder to the smaller pully on the crankshaft. (I did A/C and P/S delete last year). I took between 1 and 1.5 lbs of rotating mass off of the crank. Can't feel a differnce yet.
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