New York State E-Z Pass is not advertising it very much, but hybrid owners are entitled to a 10% discount on their E-Z Pass tolls.

You write to the NY E-Z pass service center, and include a photocopy of your registration, and request that your hybrid be added to the "NYGRN" discount program.

I don't know if any of the other E-Z Pass states have any similar programs, but it never hurts to ask.

If you find any other highway toll discounts for Hybrids, how about posting them for everyone to see.