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.
With a few exceptions, the trucks burned less fuel in the first, speed-limited trial. More than three decades later, the double-nickel U.S. speed limit enacted in the wake of the 1973 Arab oil embargo has faded into history on most highways. But so has credibility for the claim that higher truck speeds beget better fuel economy.