I have been doing pulse and glide with my Subaru Impreza and I have been using a vacuum and AFR gauge to help me accelerate efficiently. I have tried acceleration (pulse) at different loads with leanest possible fuel mixture with locked torque converter at 1800-2500rpm depending on my speed. I pulse for about 5-8 seconds at (~5in-hg vacuum & 14.5:1 AFR) and glide for about 7-10 seconds. Doing this constantly down a freeway led to almost exact same results as just using cruise control on a flat surface. If I glide anymore my speed becomes too slow. Not sure why but my car engine brakes substantially more than I feel it's necessary during fuel cutoff. Anyway I haven't been able to improve my mileage much by doing stuff such as driving with load, driving without brakes, or engine shutoff during stop. Maybe 5% total savings in gas but nothing worth the effort. This is strange because when I drive efficiently with my dad's Acura RDX I can substantially improve MPG just by watching boost levels and following tactics mentioned above (I'm talking in excess of 15%). In fact the RDX can beat my Impreza's mileage sometimes despite being 1000lbs heavier and with a substantially larger frontal area. Maybe NA engines don't have much wiggle room?