Ah, umm... no. Currently, diesel is near or cheaper than gas. To put it more into perspective for your state:
Most expensive gas: $3.19 (for regular)
Most expensive diesel: $3.15
Cheapest gas: $2.72
Cheapest diesel: $2.86
For my state.....
Most expensive gas: $3.51 (for regular)
Most expensive diesel: $3.19
Cheapest gas: $2.84
Cheapest diesel: $2.67
Keep in mind... normally, diesel engines are able to get much better milage than a gas engine, and, for the most part are easier to maintain.
2004 VW Jetta
2.0L 4 cylinder GAS (115hp, 122 ft-lb) 31mpg, 450mi range max
1.9L 4 cylinder DIESEL (100hp, 177ft-lb) 46mpg, 667mi range max