I've had my new Mach 3. 8 edm's in for a couple of hundred miles now. These are really fine sticks. Noticeably more power than with the 1. 5's I just replaced. The power delivery is very smooth & the smoke totally controllable. At cruising speeds I am actually seeing lower egt's by 50-100*! My last 230 miles netted 19. 5 mpg in mixed highway township road use. That's about the same as with the 1. 5's.