Here's one to think about: start the engine late and turn it off early. Say you drive your vehicle 4 times a day, and it takes you 5 seconds to buckle up, mess with the radio, and do whatever else you do before driving away. Same at the end, unbuckling and so on. If you start your engine first and turn it off last, you're idling for an unnecessary 10 seconds a trip.

Doesn't sound like much, but x 4 trips a day = 40 seconds daily x 365 = 14600 seconds / 60 = 243 min / 60 = a little over 4 hours a year your truck is running at exactly 0 MPG.

Can you tell I once worked at American Airlines, where they saved $100,000 a year by taking a small tomato out of the dinner salads? Well, back when there WERE dinner salads.