Ask Slashdot: How To Clean Up My Work Computer Before I Leave?
Why on earth would you put information that is personal and has nothing to do with the performance of your job on company property? It makes that information effectively company property. If our employees just absolutely must do their Amazon.com shopping while they're at work (and effectively doing their job), they're permitted to bring in their own equipment and use the guest network.
Fuel Efficiency and Slow Driving?
I'd say the way people blast off from the green light like their in a Formula 1 Grand Prix* is probably doing a bigger number on fuel economy in city driving more than anything else.
* or not if you were Hamilton yesterday.