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Mazda CX-9 Real World MPG

140 messages,  Last post on Feb 13, 2009 at 11:14 AM

You are in the Mazda CX-9 Forum. Your Hosts are steve_ & tidester

What is this discussion about? Mazda CX-9, SUV

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#135 of 140 Re: My daughter's science project with CX9 MPG [bobw3] by ceric Feb 12, 2009 (12:30 pm)
Replying to: bobw3 (Feb 12, 2009 10:57 am) You have mistaken my data.   The four numbers at the first row represents the MPG collected from various speed (35, 40, 45, 50 mph). Each data point is an average of four trials (back and forth twice). The ScanGaugeII computes MPG every 1 second or so. I reset the trip computer at the start and observe the average MPG at the 2-mile end. There are other factors that cause variations more than the ScanGaugeII such as the wind resistance. (on the day of our test, it was pretty windy) I also employed the cruise control to avoid human foot pressure variation on gas pedal.
#136 of 140 Re: Hopefully [bobw3] by tidester HOST Feb 12, 2009 (4:18 pm)
Replying to: bobw3 (Feb 12, 2009 11:10 am) Your original question was why it made a difference...   Actually, that was Steve's question, not mine.   What I'm talking about is the accuracy of person's ability to fill up the tank to the same level every time ...   The information for doing it correctly is available based on what you pay and the price per gallon for your current fill up AND your previous one. Nevertheless, you have a point because most of us are not going to take the extra bookkeeping steps.   tidester, host SUVs and Smart Shopper
#137 of 140 Re: Hopefully [bobw3] by steve_ HOST Feb 12, 2009 (4:56 pm)
Replying to: bobw3 (Feb 12, 2009 11:10 am) It's the inaccuracy of the fillup   Well, ok, but I live in a perfect world and Tides will vouch that my mpg spreadsheets are accurate out to 9 decimal points. Replies to this message: tidester (Feb 12, 2009 9:45 pm) bobw3 (Feb 13, 2009 7:49 am) steve_ (Feb 13, 2009 11:14 am)
#138 of 140 Re: Hopefully [steve_] by tidester HOST Feb 12, 2009 (9:45 pm)
Replying to: steve_ (Feb 12, 2009 4:56 pm) Tides will vouch that my mpg spreadsheets are accurate out to 9 decimal points.   Absolutely! But you never did tell me how you measured your fill ups to the nearest molecule or distance travelled to the nearest millimeter!   tidester, host SUVs and Smart Shopper
#139 of 140 Re: Hopefully [steve_] by bobw3 Feb 13, 2009 (7:49 am)
Replying to: steve_ (Feb 12, 2009 4:56 pm) okay, okay I give up!   My basic point was that point and short distances measurements aren't as accurate as those measured over longer distances. Replies to this message: steve_ (Feb 13, 2009 11:14 am)
#140 of 140 Re: Hopefully [bobw3] by steve_ HOST Feb 13, 2009 (11:14 am)
Replying to: bobw3 (Feb 13, 2009 7:49 am) Point taken.   It is interesting how the theory works out. I have a spreadsheet with ~400 tanks over a decade on my minivan and I could delete a few of them and it wouldn't affect the lifetime mpg. At least not out to one decimal point.

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