>> remember that alternator already generates huge amounts of energy. No, the alternator converts mechanical power generated by the motor to =20 electricity. If you draw more power from the alternator, you put more =20 mechanical load on the main engine and reduce milage. There might be =20 some slight hybrid effect (the alternator would produce some power =20 when coasting or slowing down, even though you're not loading the =20 engine), but I'd be very surprised if it were significant. BillW --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .