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.
Castrol Professional notes that the fuel-specific gap in average mileage widens once more as cars get slightly older. In the 5-6 year bracket, diesel-powered cars travel an average 11,132 miles between two oil changes â 19.4% further than their petrol counterparts, travelling 9,322 miles.