1 Census 2010 Race for Effingham County, Illinois. 2  Census 2010 Latino for Effingham County, Illinois. 3  Census 2000 Race for Effingham County, Illinois. 4  Census 2000 Latino for Effingham County, Illinois.  Illinois Voters for Effingham County, Illinois.
On average, a truck traveling at 65 mph instead of 75 mph will experience up to 27-percent improvement in fuel consumption. As a rule of thumb, for every one mile per hour increase in speed, there is a corresponding 0.14 mile-per-gallon (mpg) fuel consumption penalty, says Kedzie.
Driving faster increases the drag force due to aerodynamics on your vehicle. The drag force increases at the square of your velocity, so driving twice as fast results in 4 times the drag force. You WILL get better gas mileage at 60 mph (or even better, 55 mph) than at 95 mph. There isn't even an argument there.