After two consecutive weeks of increases, the price of diesel dropped 2.5 cents per gallon this week to $2.531 from $2.556, according to the most recent data from the Energy Information Administration (EIA). That is $1.125 per gallon cheaper than the same week last year, EIA said. Unlike last week – when diesel prices spiked in every region – this week, diesel is down across the board, for the most part. The only region to see an increase is the Rocky Mountain area, which increased a slight 7 tenths of a cent per gallon. All regions remain under the $3-per-gallon mark, according to EIA. Average U.S. retail pump prices for gasoline are also down this week. The average price per gallon dropped 6 cents to $2.277 from last week’s $2.337. That is 84.3-cents-per-gallon less than the same week last year. Gas prices are also down across the board, with every region remaining well below the $3-per-gallon mark. The most significant drop this week is 10.5 cents in the Midwest, where prices are down to $2.300 from last week’s $2.405.Oct. 20, 2015, is World Statistics Day, and EIA is celebrating with a 20-question energy quiz it created to highlight key energy statistics. According to EIA, the first World Statistics Day was celebrated in 2010 with more than 130 countries and areas participating. In 2012, the United Nations Statistical Commission decided to observe the day every five years on Oct. 20, EIA said.