According to Fuelly, real CR-V 2012 owners gets 26.9 MPG average compared with 28.5 MPG of real CX-5 owners.
With 15K miles / year @ $4 / gallon that's only $125 / year difference. The CR-V has a 2.4L engine, has more power.
I believe the MPG hit for the 2.5L would not be that much. Lets wait few days and see.
Yeah, I would get the Diesel too, when Mazda should fix its oil-rising issue, not before. If they never officially fix the problem, I'd wait until people stop complaining and would not get a car with serious engine longevity issues, which is not appropriate for short drives (mine is ~10 mile commute, and it's too short apparently).
However, from an economical standpoint, it would take a long time to get back the extra $$ one pays for a 2.2D until fuel-savings will make it worth-while, not accounting for the extra maintenance cost.