For every 10% ethanol added to the fuel, a mileage loss of 3% should be expected.
The cetane number is a measure of a fuel´s tendency to ignite in the absence of an ignition source (flame or spark).
Because of spikes in gas prices, even more businesses are looking for wiggle room on their mileage rates, said Allenstein, who advises employers in Wisconsin, Minnesota, Michigan, Indiana and Ohio.
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