We entered a 2008 stock-bodied Hyundai Sonata in the July 2010 Progressive Automotive 100 MPGe $10 Million Fuel Economy Race. Our unofficial best recorded economy was 57 MPG at one of the trials at Michigan International Raceway. Our official best, signed off by Roush Industries, was 41.99 MPG HWY. Considering the car sported 30 MPG on the window sticker, this = a 40% increase officially, and using the 57 MPG number, an unofficial 90% increase. There is a write-up on it
here.
