Yes, I can imagine doing 200 models would be difficult, and probably the number of data points on each would be insufficient.

Still, I keep on hearing it argued that the hybrids have a particularly large gap between epa figures and real results, and that several Prius size non-hybrids get real world mileage similar to the Prius without the expense.

It would be good to do a few comparisons if the data is amenable.