Also, if you have an automatic, you could use the alternator like someone else on here suggested using the ac. Rig it up somehow to only kick on while coasting. The alternators on most cars are so overpowered it would still charge the battery sufficiently and rob a negligible (OT: Is there a spell checker on this forum?) amount of fuel. If it didn't require so much work, I'd like to move the alternator to the driveshaft and wire to a contactor to start charging when the brake lights turn on. DIY regen braking, but seems like a lot of work to me for what darren observed to be ~10% FE gain.
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