Mine also -- checked it against the gas pump and it was real close to where it should be. I averaged 29.46 to and from Naples last weekend. Florida is not as flat as people think… Saw as high as 36 mpg at 72 mph. Impressive!!
Just finished a round trip from phoenix to la. Averaged 26.9. This included about 70 miles of 'la" traffic. Hiway milage was aroung 29 at 75 to 85 mph. Radar detector worked perfectly. Goosed up to 125 over a 2 mile range. Wow what a ride