Here in green CA we have greener gas at a cost and I believe greener diesel also also at a cost , diesel hasent been cheaper than gas for years ,still cheaper overall than gas in my VW TDI that get up to 50mpg
I heard on the news the whole country will be getting a new greener gas by I think it was 2016 at a cost of about 6 cents per gal , ya right, bet its more
Anytime you factor in the lifetime miles (say 500k) you get out of a diesel motor , you come out ahead , no matter the cost of fuel
And theres also higher resale value
As far as maintenance I find diesels easier to work on than gas and as cheap, with way less to go wrong , aside from taking 3 times the oil to change
I havent owned a gasser anything in 12 years