It won't come as a surprise to learn there's been a large increase in the number of diesel-powered and hybrid cars on the road, either due to gasoline price increases or environmental concerns. But the size of the increase may surprise you.

RL Polk compiled information from national vehicle registration data to give a better idea of how many of these cars are out there. For example, clean-diesel registration has increased 24.34% from 2010-2012 (an increase from 640,779 to 796,794).

Hybrid car and SUV registration has increased even more; by 33.58% during the same time (an increase from 1,714,966 to 2,290,903).

While these numbers are impressive, they contrast to the overall number of SUV registrations, which increased by only 2.75% during the same time.

The following numbers are for the growth of diesel cars and SUV's from 2010-2012:

1. California +55%
2. Massachusetts +45%
3. New York +43%
The following numbers are for the growth of hybrid cars and SUVS from 2010-2012:
1. South Carolina +50%
2. Tennessee +48%
3. Kentucky +46%

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