1. Haven't noticed any vibrational problem with the doors. Is it a rattle?
2. Gas mileage has gradually been improving as I approach 6,000 miles with Mobil One now in the crankcase to around 16.7 combined with highway/stop and go about 50/50. This is a 4,700 pound vehicle, and I've found wind resistance over 60 mph is formidable around the front end and windshield (when you roll down the window you can definitely hear it), 60ish seems to be a good highway economy speed. If you do a lot of offroad, I've gotten as low as 12 using low range for a bit.
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