That's one reason I steered clear of the diesel. Gasoline is always cheaper than diesel in my home area. It's been especially bad the past 6 months or so.
Tonight at the cheapest couple stations around me diesel is $2.19 and 87 oct is $1.84, so that's a 35 cents premium. Back in December the difference was as much as 59 cents higher for a few weeks.
Usually during the summer months diesel is only 10 to 15 cents higher. When it gets up over costing 25 cents more than gas that cuts into the mileage benefit you get with a diesel. Up over 40 cents and there's not much of any advantage.
Seems like not long ago I was buying 87 octane for $1.09 & diesel was like $1.15. Aggravating, ain't it??