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Old 08-12-2009, 10:04 AM   #1
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MPG vs MPH at different throttle settings

I just finished entering all the data from movies I took of my SG2 while accelerating at a constant throttle in fifth gear on my local "level" and "straight" test road. I found out afterward that mutable glare (from clouds moving I suspect) and my camera's inability to focus consistently on my SG2 (holding a piece of junk mail in front of it for the first instant when it determines the focus was much better) left some data unreadable (and a lot more hard to read), but I have enough to draw conclusions. I would lose either an entire run or nothing, so each piece I collected is complete. Need to put a sun shade over it next time. I ran data for each throttle in both the slightly uphill and slightly downhill directions and they don't differ much, so that redundancy helps fill the gaps. As I increased my throttle settings, the amount of road required for the test run diminished and it became harder to use the exact same piece to account for it not being flat (I seriously doubt it's a consistent grade the whole length). Also, at lower throttles bumps in the road made it very hard to keep my foot steady, especially in the downhill direction (worse bumps in that lane) so the curve jumps around. At higher throttles the greater force of the return spring made it easier to keep things steady and since I needed less road I could restrict my runs to the smoother parts. I also typed in the time data from the movies so I can compute the total energy needed to accelerate to various speeds, which is really what I care about for pulse and glide calculations. I'll need to smooth the curves a bit as well. I'll work that out once my eyes stop hurting. I tried to zero the avg mpg setting for each run, but getting it timed properly and then switched over quickly so I didn't miss anything wasn't practical (at least by myself).



Click for bigger version. The number is the throttle setting and U = uphill and D = downhill.
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