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I started out with an US EPA rated car that is estimated to get 22 city, 28 highway, 24 combined. I was averaging 27-28mpg winter, 29-30mpg summer. When I started hypermiling I managed 32-34mpg. As I brought in more P&G that came up to 36-38mpg, then winter came. Now I should be getting the worst mileage of the year, but I've managed to hold it around 36-38mpg because I'm going EOC at every safe opportunity. I suspect if it was summer I'd be pushing 42-43mpg with EOC P&G. My last tank was 39.3mpg.
IMHO, just good hypermiling technique will buy you a 15-20% improvement over EPA highway numbers. Simply by anticipating stops, avoiding unnecessary braking, coasting when practical, using DFCO on longer, steeper descents, and driving with a light foot near the speed limit. Adding in some pulse and glide with the engine on will give you another 10% and shutting the engine off on your glides and at stop lights will gain another 10%.
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