Saving On Gas: Fact Or Fiction? - KLTV.com - Tyler, Longview, Jacksonville |ETX News

4/4/08- East Texas

Saving On Gas: Fact Or Fiction?

You may have already gotten advice on supposed ways you can save on gas. Everything from filling up in the morning to the way you squeeze the gas nozzle. But what's true and what's fiction? KLTV 7's Courtney Lane set out to find the answers for you, in Friday's pain at the pump.

You may see gas stations busier in the morning or early evening. People are not only filling up around their work schedules, but maybe you've heard this: It's cheaper to buy gas at the coolest times of day. Truth or myth? We asked an expert, a physics professor at LeTourneau University.

"They're far enough under ground and the tanks are large enough that they should only change in temperature a few degrees and that's not going to affect what you pay for gas, at all," said Assistant Professor of Physics, Ted Forringer. 

So, according to our expert, myth. Well let's try this one. When filling up, don't squeeze the trigger too fast. Instead fill up slowly to get more for your buck.

"The longer you take to fill the tank the more vapor is going to escape, due to evaporation," said Forringer. "It's like leaving a glass of water out in the sun. The longer you wait, the more water's going to evaporate. So I would fill it up as quickly as possible."

Alright, another myth, filling up slowly won't make a big difference. What about filling up when your tank is half full, as opposed to filling up on empty?

"The thing that I've heard people say is that the empty part of your tank is filled with gas vapor and then when you fill it up all that vapor gets pushed out of the tank," said Forringer. "But that's really a very small affect. Even a 20 or 30 gallon tank would only have 3-hundredths of a gallon of gas in that vapor state. So that's only a few cents worth of gas."

Once again, just a myth, but they can't all be. Ever hear not to fill up when a gasoline truck is pumping at a station?

"If the tanker's been driving on Texas summer roads and the fuel's real hot inside the truck and they dump hot fuel inside the tank, it is possible that would actually cost you some money at the tank," said Forringer. "So, not sure it's worth driving 20 miles to go to the other side of town, but yeah maybe that one actually has some legitimacy."

Finally, a little fact with all the fiction and hopefully we've cleared up some of those gas-saving rumors. 

Courtney Lane, Reporting  clane@kltv.com

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