Audi, IMO the Q5 TDI would sell very well as gas prices climb this Spring and Summer and Diesel prices keep falling.

Gas prices have been steadily climbing for a month now and are expected to climb more as the gas supply gets more and more constrained due to refinery shutdowns. Diesel supply from refinery conversion is coming online now and much more in the near future

... the Q5 3.0L TDI cannot come fast enough and is already late as BMW and Benz already offer diesels. Diesel may once again become significantly less expensive than even Regular gas this summer and Audi will be caught behind the curve...

GLK and X3 are not available with diesel engines either. Q5 is in the same class as the GLK and X3. Maybe there is a reason for this. Maybe they just want to annoy you.

Go buy the Q7 TDI, it will give you 1 extra mpg in the city and possibly 2 extra on the highway over a gasoline powered Q5.

The Q5 with the V6 TDI would get about 22/29 EPA ratings wise based on my calculations.