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.
1 Keeping the speed between 30 and 60 mph when possible lets the engine run at the optimal rate and decreases the gas mileage. 2  Avoid idling, especially if you have a large engine.  Try not to accelerate and break all the time (even though it's fun), driving at even speed can increase gas mileage with as much as 30%.