Fuel Gauge: Fifth straight diesel price decline

U.S. On-Highway Diesel Fuel Prices

Price per gallon May 12: $3.476

Week ago: $3.497

Year ago: $3.848

U.S. Regular Gasoline Prices

Price per gallon May 12: $3.120

Week ago: $3.147

Year ago: $3.608

Source: U.S. Energy Information Administration