What makes you think they ran your credit? If you didn't sign a consent form, they shouldn't have ran your credit and you could go after them legally for doing so. Besides it actually lowering your credit score by getting a credit check (funny how that works, huh?), it is none of their friggen business what your credit is to go take a test drive. They've got dealer plates on the car and have insurance for such activities. Usually they take a copy of your license, which makes sense, but I don't think they can run a credit check off your driver's license number.
I showed up to my dealer with my own financing, ready to buy. I whipped out my loan approval letter for up to $65,000 and said, "I won't need your financing, thank you.". My bank did a credit check on me, so there was no need for another one at the dealer. The only time they really need to do a credit check on you is if you're going with their financing or leasing and really then, it's the financing company that should be doing the credit check, whether it be Mazda American Finance or whoever.
They should have given you the $2.99 gas deal on the Caliber SRT-4 because they'd probably be saving money over having to pay someone's gas to drive a Durango around getting 15mpg. I believe the Caliber get's better MPG than the Speed3.