Every gas station actually keeps a glass pyrex marked bottle to be certain they aren't giving away fuel. Most pumps actually overmeasure and give away gas as they loose calibration. the fact that those bottles exist is why it is hard for dealers to e4xplain why their pumps aren't accurate. 55 degree gasoline pumped on a 95 degree day can expand as much as a half cup per gallon. Simple rule, do not fill up on hot days. When the pump shuts off, stop trying to shoehorn more gas in the tank. There are lots of ways to save gas but too many people are hard o' thinking. Car makers don't bother people with ideas like,, having injectors cleaned every 45,000 miles. Gauges that show how well the engine runs,,OMG! Some estimates say 40 percent of cars on the road are wasting gasoline because they aren't in good running order. If one tire is low it can cost you 20 percent of your mileage. It isn't just peoples faults. Car companies have no desire to sell economical cars. People do not really want to save gas or they would. The reason SUV's and minivans exist is so car companies can avoid EPA minimum fuel standards that apply to cars.
john ----- Original Message ---- From: "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> To: [email protected] Sent: Tuesday, May 27, 2008 8:06:41 PM Subject: Re: [QUAD-L] FW: gas pumps I'm not real sure just how much gasoline expands and contracts from 35 degrees to 110 degrees ( typical temp span here in Phoenix ) but that is on my to-do list to find out. I've heard this argument before and dismissed it as a micro-cause of bad mileage as opposed to running the A/C, jack rabbit starts, and the 'square' effect of speed ( force of plowing wind at 80 mph is twice that of going 40 mph). [Or is it twice every 10 mph... I forget - I'll look it up.] IF the 'swell' factor of hot gas over cold gas is say a teaspoon per gallon, that ratio is 168/167 or 0.99405. This means that 20 mpg turns into 19.88 mpg or a trip of 300 miles (15 gallons) turns into 298.21 miles. One foolish step on the gas or a little headwind and your 1.79 miles total can come and go many times over. A similar supposed savings by not pumping too fast because the extra bubbles you get reduce your gas mileage leaves me similarly non-flushed. OH, the argument that the two numbers shown on the pump not matching up correctly seems a lot less likely than just not getting a full gallon when it says you did. NOW, let's see you measure out exactly one gallon - plus or minus a teaspoon. :) AZDAVE -------------------------------------------------- From: "Tod E. Santee" <[EMAIL PROTECTED]> Sent: Tuesday, May 27, 2008 4:20 PM To: "Quadius" <[EMAIL PROTECTED]>; <[email protected]> Subject: Re: [QUAD-L] FW: gas pumps > It's just as easy, if not moreso, to rig a pump so the gallons and price > shown actually *do* match but have it pumping less. So the "10 gallons > divided by 10" method won't necessarily tell much. > > Instead, you'd need need a very accurate 1 or 2 gallon container to fill > just rigjht... then see if all the numbers match per gallon pumped. > > CNN reported today that pump calibrations at US stations are made assuming > the gas is at 60 degrees F. If as is warmer than 60 F you get less energy > (hydrogen-carbon molecules) from it -- if it's cooler than 60 F you get > more. Depending where you live in the US this could be a huge difference. > So my van should get better mileage in Bangor, ME than it does in Tucson, > AZ. > > It reported that pumps in Canada autocalibrate based on temperature so > stations don't lose out (gas gets cooler more often there). Tanks in the > UIS don't adjust for high/low temperature deviations even though it's a > very easy thing to fix. > > A truck driver tested fuel from a pump and it was over 78 F. At that rate > (if it's consistent) he would be overpaying about $1250 this year. > > Best regards, > --Tod > > ---- Quadius <[EMAIL PROTECTED]> wrote: >> This is good advice. They had the same thing happen here, but you need >> to >> contact the agricultural apartment with the pump number and the location >> of >> the gas station. If you think it's been rigged for fraudulent purposes >> and >> it's just not a calibration problem, you need to contact the state >> attorney >> general. That way he or she can launch an investigation into price >> gouging. >> >> The old adage, may the customer beware, the is very applicable here. >> Quadius > >
