Both chambers of Tennessee's General Assembly approved Gov. Bill Haslam's transportation plan on April 19, which hikes diesel taxes by 10 cents per gallon but lowers other taxes. Indiana appears poised to follow with a 10-cent gas tax increase.
Pennsylvania, the state that had the highest gas tax last year, saw the highest gas tax increase of 7.9 cents per gallon, the final increment of a 2013 law. Michigan's 7.3 cents tax increase, signed into law in 2015, is the second largest increase.