Remember the Messerschmitt KR-175? Also a three-wheel bubble car; got about 64 mpg, but top speed was only 50 mph.
The company says that the vehicle will cost $6800, achieve an 84 miles per gallon fuel economy, and they anticipate a five star NHTSA safety rating. The eight gallon tank will theoretically allow a driver to go 672 miles on a tank of gas. Top speed of the Elio is said to be over 100 miles per hour.