American voters headed to the polls on Tuesday facing the highest gasoline and diesel prices ever recorded on an Election Day, according to data from GasBuddy.
The national average stood at $4.12 a gallon for gasoline and $6.28 for diesel, said Patrick De Haan, GasBuddy's head of petroleum research. Gasoline was $1.07 a gallon higher than a year earlier, and diesel $2.59 higher. The $2.15 gap between diesel and gasoline prices was also an all-time record.

De Haan said the trend was a historical anomaly, since fuel prices normally fall in autumn. This was the only election year going back to 2006 in which prices rose in the 30 days before Election Day.
Fuel costs have risen sharply since the start of the war with Iran. In August the national average of just over $4 a gallon was the highest ever for that point in the year, and AAA data showed Labor Day prices nearly a dollar above the previous year. High prices at the pump were among the issues that weighed on Republicans in Tuesday's midterm elections.