Keep in mind that dz302 is in the US. I'm not sure there's a diesel car available in the US that can get 90+ US MPG. The most popular diesel in the US is probably the diesel Jetta and its mileage isn't anything close to 90 US MPG.
The engines and cars must be DOT (Dept of Transportation) approved, must meet all EPA (Environmental Protection Agency) regulations for emissions, must meet all safety requirements and after all that, the cars will have to be modified and will weigh about 100-400 kg more and get less MPG than their Euro counterparts.
Well emissions won't be an issue as regulations here are much stricter than in the US already. Safety may be an issue as the tests are different, but cars here are smaller so are often made safer anyway. I guess after import costs and modifictaions it would not be worth it!
Sorry Draig, that's not the case. The focus is mostly on particulates & nitrogen oxides over the pond, but here in Europe it's mostly on CO2. So the engine minimisation approach we have over here to reduce CO2 doesn't work for their requirements.
I'm with Draigfly. Regardless of the emissions laws, we (the U.S.) sell tons of 1 ton trucks with 6 and 7 litre diesel engines which pump out literally tons of particulates, yet we do not have any small, high mileage diesel cars? This makes no sense. Hopefully the times will change because we need high mileage cars here like "yesterday"!!