I understand how and why this device works, and also why the driving fun factor goes up several notches, but I read a post from Doug Payton who said his mileage will now take a big hit.

Obviously I realize new spirited driving habits will lower my mileage, but can you still drive the car "normally" and retain your decent mileage figures?

(read highway cruising at legal limits and that's 55-60 mph at best for me, I go through several radar traps EVERY SINGLE MORNING AND NIGHT during my daily commute)

Thanks
Paul