Posted by MarkB_MI on April 28, 2011 at 02:50:48 from (166.217.69.209):
In Reply to: 20 MPG posted by George Marsh on April 27, 2011 at 14:19:39:
Probably not. Cooler air temperature makes the air more dense, while high humidity makes it less dense. So those two factors are actually working against each other. The reason is probably much more mundane.
Going from 18 to 20 mpg is an 11 percent increase. That's a lot. Car manufacturers go to great lengths just to get a tenth of a percent. So the first thing to suspect is how you made your measurement. Do you go by the odometer and how much fuel it took to fill the tank, or do you use the vehicle's computer, resetting the average each time you fill up? The former method is wide open for errors. (I'm not saying the vehicle's computer is inherently accurate, but it is inherently CONSISTENT.)
If you normally gas up with 20 gallons, and you filled your tank fuller by two gallons the first time you refuel than the second time, that would give you your 11 percent. If the station you use is on a hill, and you used different sides of the pump when you fueled, that could account for most of the difference. Also, different people fill the tank to different levels; some try to get as much gas as possible in the tank while others stop as soon as the filler trips. And how fast you fill the tank affects how full it gets because the tank inlet is designed to trap air in the tank.
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