Quote:
Originally Posted by Stang70Fastback
Actually, they aren't subject to the same error. ...
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Agreed with all that. Over time it all averages out with either, but any one tank may have small variances, but probably less than 1MPG in the end.
A story about fuel pumps though. They are very accurate, but they also can be manipulated, particularly if computer controlled. A few years back a lot of stations were caught playing to the measurements. The pumps were tested at specific intervals (say 5 gallons and 10 gallons). The software would be manipulated to run faster between say one and three gallons (pump less fuel than the gauges showed) then speed up and catch up by the 5 gallon mark.
This article is outside the US, but basically explains it.
http://www.thehindu.com/news/cities/...icle534795.ece