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No carpool lane sticker for hybrids:
http://www.arb.ca.gov/msprog/carpool/faq.htm

"... in most cases, using a higher octane gasoline than your owner's manual recommends offers absolutely no benefit. It won't make your car perform better, go faster, get better mileage or run cleaner."
http://www.ftc.gov/bcp/conline/pubs/autos/octane.htm

I have done extensive tank-by-tank tests on flat highway between Ventura, CA and Santa Barbara, CA and found no difference in MPG or performance between regular and premium gasoline. Others on the Yahoo! forums did dyno tests and found (IIRC) no improvement in vehicle power output.

I don't agree with Armin about the ratings. ULEV was created in California but was adopted by the Feds as part of the "Tier 2" standards which were voluntary in 2001 and are rolling in mandatory starting this year.
 

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SeanW said:
I always understood that the carpool lanes were to reduce congestion not pollution.
Yes, however EVs and some other vehicles that do not run on gasoline can get HOV access with only one person in the car. So there is a bit of a pollution consideration. Just not for the Insight -- there are SULEV SUV's out there as well.
 
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