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The neck ones are good. We used helmet and neck ones in the desert, and it didn't really matter how long they lasted because we had a cooler with ice water sloshing in the bottom and could toss them in it for a recharge. Dunking these things in cold water chills them quickly but you end up getting soaked- which is fine if it's 120 degrees and you're away from home for a year but isn't what you're looking for as a commuter.
The best personal heat sink I know is a soda can or three. They hold the temp for a long time and if you don't drink them, they're reusable. They're cheap, available pre-chilled everywhere and being in posession of one doesn't automatically make you some crazy-eyed hypermiler.
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Originally Posted by sheepdog44
Transmission type Efficiency
Manual neutral engine off.100% @∞MPG <----- Fun Fact.
Manual 1:1 gear ratio .......98%
CVT belt ............................88%
Automatic .........................86%
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