Car was with mechanic - let idle for a while - how to handle? - Page 2 - Fuelly Forums

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Old 02-15-2012, 12:44 AM   #11
BDC
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What you can do if you really want to ignore that data without losing the data from a full tank, is just fill up immediately before and after (as soon as you pick up the car) and ignore that fill-up.

That way you just throw out the data you think is bad. You don't have to wait until the tank is empty to fill up if you aren't going to use the data anyways. Throwing out a whole tank won't affect your mileage much, but it will affect your cost of ownership data.

What was the average for this tank that you threw out anyways? Just out of curiosity.
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Old 02-15-2012, 12:54 AM   #12
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^^ Not sure what the average was. I had dropped the car off with an OBC (on-board computer) MPG average (pretty close to what Fuelly indicates) of 22.8 - 23.8 MPG. Got the car back with an 11.2 MPG rating. I can find the odometer info I think in fuelly somehow and manually calc out the average.
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Old 02-15-2012, 12:57 AM   #13
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Looks like it went from 202442 to 202667 and took 11.72 gallons to fill, so it would avg 19.1 MPG for that partial tank.
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Old 02-16-2012, 02:12 AM   #14
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I would still add the fill-up otherwise it's kind of like cheating your way through the best MPG. You shouldn't skip any fill ups, I almost did that once. I get 10-20% worst mileage in the winter and I tend to idle my car during cold mornings when I have to go to work.
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Old 02-16-2012, 06:21 AM   #15
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I idle my car a bit before I leave for work too (I am in PA), but I count that. I just don't count the time the car is being driven in a manner other than usual. I think it makes sense. Like a manufacturer would only record MPG on a test track, not on the way to the test track.
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Old 02-16-2012, 07:47 AM   #16
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My only point to add to this, is when you throw out that tank, you also throw out the amount you spent, so it affects more than your mpg. As I said before, the impact will be non-noticeable after you have had a few. I have had to get 3 tanks in a row at 12 mpg to actually cause the average to go down from 20.9 to 20.8. Crazy.

Its your fuelly, but still, something to think about.
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