We will be reviewing the 2007 Acura MDX this week, and should have a review published by the end of next week. We will take a look at the specific problems you describe.
That said, many cars with six speed trannys will cruise at 60mph or above in sixth gear with RPMs running barely above idle. If you're seeing 2,000 RPM at 60mph, it's only going to drop down to about 1,600 RPM when you coast. The sixth gear is designed to save fuel. But if the engine's running at 3,000 RPM at 60mph, and it stays above 2,500 RPM when you coast, then you might have a problem.
I haven't looked at the tech specs for the MDX yet, but some trannys have 'smart' technology, and they try to adapt to your driving style. It may be that the tranny needs more time to learn how you prefer to drive, or is just guessing wrong.
Much to say about this car, most good, although it feels like they have overdone some electronics and not tested all on real people (list will follow).
I have one major question and would appreciate if anyone has some insight:
When driving at 60MPH I take the foot off the accelerator and the RPMs hardly drop. It feels like the engine continues to pull fuel and "do something" when I would expect it to simply wind down.
Also, when driving between 25 and 30 MPH and take the foot off the accelerator the car shifts down brusquely, and it feels is as if I were driving with the parking brake on.
Fuel consumption is poor, regardless how carefully I drive.
Does this seem normal? Having driven many different automatics of all sorts of makes and models (US, European, Japanese and Korean), this is a first. It seems like the car is trying to do too much for me and definitely the wrong thing.