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1. Regulations requiring that NEW trucks get better MPGs aren't going to force any old vehicles off the road, other than for economic reasons. Actually, after the DPF was added to the diesel engine (and caused a decrease in MPG), most truck owners would welcome any regulation that was intended to increase the MPG. Urea was actually a good start, since it lets the engine run a bit dirtier and not regenerate as much.
2. The lovely state of California has banned any truck with a 2006 or older engine from its ports as of 1/1/2012 anyway, and I have a feeling they have a lot more in store for us
3. Almost every truck on the road is actually rated for 92,000 pounds, its simply government regulations stopping them from being used at their full gross weight. Usually, they have a 12,000 pound steer axle, then two 20,000 pound axles that make up the tractor tandem, and another set of two 20,000 pound axles that make up the trailer tandem.
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