According to the Department of Energy, diesel rose 2.7 cents to $2.652 per gallon, making it the most expensive it’s been so far in 2009. Just over the past month, diesel has risen 15.6 cents, a definite change in the trend we’ve been getting used to. But we’re still much better off than we were at this time last year, when diesel and gas prices were pushing the $5.00 mark.