Any time you average over 65, you're not going to hit EPA. EPA numbers (if I recall right) are taken at 50-60 mph. Not only are modern cars geared accordingly, but modern engine electronics run the car much leaner in cruise at the typical rpms the car is doing at those speeds. If the car is short-geared (if I recall right, again, the Tucson six-speeder has a very short sixth), then at 65 and over, you're out of open-loop tuning and up in the powerband, where the car runs richer for overtaking power.
Older engines, such as the K-series in the Element, don't resort to such drastic measures, and give similar economy up and down the powerband. And if it shares the same five speed as the CR-V we've got, it does lower rpms in 5th than the Hyundai does in 6th.
I've gotten decent numbers out of Hyundais that I've test driven, but I generally drive at a "price-of-gas-conscious" 50-60 mph.
Can't wait to test-drive the new CX5. If it drives anywhere near as good as other new Mazdas, it might be our next car.