@blackmailismylife: True, critical mass bike rides won’t save the earth, either. But I do get a little annoyed by the self-righteousness people tend to get with they buy a brand new hybrid and act like they’re “doing their part.” That’s bullshit and we all know it. Buying a brand new car, made of thousands of brand new materials shipped from all corners of the globe, to a factory in Asia, then shipped complete on big tanker ships to the United States is far less saving the world than, say, driving your old beater ‘85 Honda Civic until the thing dies.

But all those arguments will be moot soon anyways, what with gas prices pushing $100/barrel and China lifting it’s cap on subsidized fuel. Ain’t gonna be no gas nohow.

Temperature is probably not significantly important, because the underground fuel tanks maintain their temperature through geothermals. Tanks are usually sitting a couple feet underground, beneath 6″ of concrete, surrounded by earth with a constant core temperature. Heat rises and fuel is pumped from the bottom of the tank, thus rendering this argument all but null from where I’m looking.

As for fulling up when the tank is half full. I’d call bullshit on this one too, for a couple of reasons. The first reason is that one gets better fuel economy when there’s less weight in the car. By not letting the car get down towards empty, one is missing out on the opportunity for maximum fuel economy. Secondly, filling up with gas takes time, and time is money (to some people). Therefore, the less time wasted at the pump, the better. I will admit, however, that neither of these things really makes any difference in the long run. But then again, nore do any of these gas saving tips.

No offense, but I don’t take car advice from a bicyclist