[ever_green]

for my subaru: i didn't improve my mileage but i did increase average speed without hurting average mpg. instead of cruising at 65mph (2700rpm), i cruised at 75mph (3000rpm). i guess my engine likes higher rpm (more ignition timing, oversquare design, bsfc sweetspot, more valve lift). from a dyno chart looks like the engine has been tuned for 3000-5000rpm. lack of torque below or above that engine speed, specially below 2.5k rpm.