Why not have speed and mileage? Haters gonna hate.
In my Prius, I generally accelerate at least as fast as traffic, but I play the cruising and braking better. I get 55-62MPG during the summer doing my commute and whatever local driving. Over the whole trip to pick up my Insight (El Paso, TX to Farmington, NM and back, a little under 1000 miles total) it averaged 48MPG doing 70-75MPH, mainly with cruise (Insight got 61MPG coming back, attempting the same speeds with no cruise). Only mods are 51PSI in the LRR tires, a lower grill block, and a semi-WAI (popped the intake tube off the airbox).
I personally am more interested in playing the city MPG game. Highway mileage mainly depends on the car and speed. Most of my highway miles are long trips, so I go the speed limit to shave hours off the travel time, which leaves the car as the only variable I can change.