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.
How will a supercharger affect my fuel economy? With the addition of a supercharger kit, your average miles per gallon (MPG) will change. That change can be an increase or decrease in fuel economy depending on your driving habits and application. Often an increase in fuel economy is seen under standard driving conditions with the addition of a supercharger.