Um, small detail here, but the refund is not calculated at 9.1 cents per gallon, it is calculated as 2.8% of purchase price. Starting in June, Virginia stopped assessing fuel taxes on a cents per gallon basis, and switched to a percentage tax rate. This was done to save the pols from having to vote to increase tax rates in the future as fuel costs rise. The rate is 3.2% for gasoline and 6% for diesel, but light trucks and cars get a refund of the difference between the two rates, which is 2.8%.
Le'see, that's 9.1 cents per gallon PROVIDED YOU PAID $3.25 per gallon for the diesel fuel. I just sprang for a tankful at $3.62 a gallon, so I'll get back 10.1 cents per gallon.