Quote:
Originally Posted by Ian33
6) The trip computer seems to be fairly accurate. Some feel it may be 1 to 2 mpg too generous, however this could be do to the amount of gas in the line, or overfilling. There is also no car (including the Prius) that has perfectly accurate odometers ether.
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I have been running a test to determine the error in the MPG meter over the last 5 tanks and it is consistently overestimating by 2.1-2.3 MPG.
Something that may (partially) account for this is evaporation. I usually go 2.5-3 weeks between fill ups and from what I have been reading on the web gasoline usually evaporates at around ~.07% per day, which over say 18 days is 1.26%, or ~.25 gallons. That accounts for around 35% of the computer overestimate in the MPGs...