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 does tire size affect gas mileage? A: Larger tires are heavier and have more resistance on the road, which can drastically decrease the overall fuel economy of a vehicle. Larger tires may also require larger wheels, which can increase the weight of the vehicle. A driver is expectant to see up to a 10 percent loss in fuel economy when increasing a car's tire size.