Fun fact: For most cars the sweet spot on the speedometer is about 40 to 60 mph, and generally, doubling your speed requires more than double the horsepower. Sp

Fun fact: For most cars the sweet spot on the speedometer is about 40 to 60 mph, and generally, doubling your speed requires more than double the horsepower. Speeders likely already spend more than $0.25 in gas per trip from lost fuel efficiency. Even more when there are stop lights and other traffic.