[QUOTE=bdgr]
Actually, Mercedes makes a diesel family sedan. E320 BLUETEC Sedan..NOT legal for sale in California, Connecticut, Maine, Massachusetts, New York, Pennsylvania, Rhode Island, or Vermont
Audi has at least one planned for 2009
BMW told me that they would have at least one released by the end of 2008, but no word yet
Caddilac has one planned for 2009
And honda has one that should be released by 2010.
All of this info I got speaking directly with representatives from the manufacturers.
yes, diesel is more expensive RIGHT NOW…it fluctuates…a few months back it was cheaper than gas…before that it was more expensive. I run 100% biodiesel in my mercedes (pump biodiesel not waste veg oil) and it’s 20 cents a gallon cheaper than dino based diesel, but still more than gasoline.
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[/QUOTE]
At something quite a bit north of 50 large, the Mercedes is a luxury sedan, not a family sedan. It gets around 24 mpg or so.
The Audi is the one with the VW engine I spoke of. Both this and the Touareg as SUV’s. Sorta. 
BMW has a plan for one in 2010, another luxury sedan.
Honda is “in the pipeline” (it’s a Pilot, a mid-sized SUV),along with Subaru, which should be a Forester- and one can call a Forester a commuter car or family car. I suspect both might get decent MPG, but not great.
No word on the Caddy. All this per the July 2008 issue of MotorTrend.
Lots of Big trucks and SUV’s will be coming out running diesel. There’s only the Jetta and maybe the Subaru that could be considered commuter or family cars. Sure, those big trucks and SUV’s will get better MPG from diesel, but no one is thinking “wow, I’d better buy that 16 MPG diesel truck to save on my monthly commuter gas bill!”
They want 30+ MPG. None of these, except the Jetta, will be getting that.
Diesel ain’t coming down. THere’s some future in biodiesel but food shortages make make this passe also.