Diesel dropped 2.3 cents to $3.778 a gallon, the lowest national average price in more than two years, the Department of Energy reported Sept. 22.

Diesel, which has risen just twice since April, has plunged 24.3 cents since mid-March and is 17.1 cents below a year ago.

The retail average price is the lowest since trucking’s main fuel averaged $3.695 on July 16, 2012.

The price declined in all regions, led by a 3-cent drop in the Midwest to $3.713, DOE figures showed.

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