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NeilBlanchard · 05-12-2011, 02:39 PM

Okay, I started to calibrate the Speed setting on my SG2 today, and I got some interesting results.

I drove a measured route (the one for the upcoming mileage contest sponsored by Acton Toyota and CleanMPG.com May 15th), that is 24.3 miles long as measured by Hobbit's GPS:

MPG rally 2011

I already had the Speed calibrated by '3' (my unit doesn't display a % symbol), and I drove the route, and got 22.5 miles on the stock odometer, and 22.9 miles on the Current Trip measurement. Please notice that 22.5 + 3% = 23.1, which is not all that close to what it showed.

So, I tried to figure out what factor would increase 22.5 up to 24.3, and I came up with 20 -- but it was obvious that was way too high by the time I got to the 5.8 mile turn onto Gay Road, so I did some more estimation, changed the factor to 10, and reset everything and returned to the beginning of the route, and it seemed a bit too high still, so went down to 9.

I drove the route a second time, and the stock odometer said 22.5 miles (same as before) and the SG2 Current Trip was 24.0 miles -- nearly there!

So, I increased the Speed calibration factor back to 10, and drove the course a third time -- and very strangely, the SG2 Current Trip now said 23.7! Wassup 'wid dat?!

Doing the math to correct the 22.5 miles on the odometer up to 24.3 is almost precisely 8%. Which is great, but I am even more puzzled about the SG2...

I ran out of time, but I am very curious to drive the course with the Speed factor set to 8 -- maybe somehow the time vs distance = speed calculation gets better when the factor is right on? Hmmm...

05-12-2011, 02:39 PM	#3 (permalink)
NeilBlanchard Master EcoModder Join Date: May 2008 Location: Maynard, MA Eaarth Posts: 7,908 Mica Blue - '05 Scion xA RS 2.0 Team Toyota 90 day: 42.48 mpg (US) Forest - '15 Nissan Leaf S Team Nissan 90 day: 156.46 mpg (US) Number 7 - '15 VW e-Golf SEL TEAM VW AUDI Group 90 day: 155.81 mpg (US) Thanks: 3,475 Thanked 2,952 Times in 1,845 Posts	Okay, I started to calibrate the Speed setting on my SG2 today, and I got some interesting results. I drove a measured route (the one for the upcoming mileage contest sponsored by Acton Toyota and CleanMPG.com May 15th), that is 24.3 miles long as measured by Hobbit's GPS: MPG rally 2011 I already had the Speed calibrated by '3' (my unit doesn't display a % symbol), and I drove the route, and got 22.5 miles on the stock odometer, and 22.9 miles on the Current Trip measurement. Please notice that 22.5 + 3% = 23.1, which is not all that close to what it showed. So, I tried to figure out what factor would increase 22.5 up to 24.3, and I came up with 20 -- but it was obvious that was way too high by the time I got to the 5.8 mile turn onto Gay Road, so I did some more estimation, changed the factor to 10, and reset everything and returned to the beginning of the route, and it seemed a bit too high still, so went down to 9. I drove the route a second time, and the stock odometer said 22.5 miles (same as before) and the SG2 Current Trip was 24.0 miles -- nearly there! So, I increased the Speed calibration factor back to 10, and drove the course a third time -- and very strangely, the SG2 Current Trip now said 23.7! Wassup 'wid dat?! Doing the math to correct the 22.5 miles on the odometer up to 24.3 is almost precisely 8%. Which is great, but I am even more puzzled about the SG2... I ran out of time, but I am very curious to drive the course with the Speed factor set to 8 -- maybe somehow the time vs distance = speed calculation gets better when the factor is right on? Hmmm... __________________ Sincerely, Neil http://neilblanchard.blogspot.com/