WASHINGTON--(BUSINESS WIRE)--Working with Runzheimer, the leading business vehicle technology and solutions provider, the Internal Revenue Service (IRS) today announced the new national, optional business mileage deduction rate of 54.5¢, which goes into effect January 1, 2018. The 2018 rate represents a 1 cent increase from the current 2017 rate of 53.5 cents-per-mile. "Across the US the average costs of owning and operating a vehicle rose just one cent over the last reporting period for this c