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Scangauge data. It's currently calibrated for DWL, and the last fill up it was within about 1% accuracy.
Distance was about 90 km / 55 mi.
I'm pretty sure the SG average speed calc is distance/time when the vehicle is in motion.
No, I'm not positive. (I think it's nearly impossible to tell 100% just by looking down a road whether it's totally level.) The entire trip is a net decline in elevation from 405 to 340 feet though.
But I'm confident that even if it were a slight decline, I still could have held the 100 just by going slower. The main thing helping was when the road direction lined up well with that 12 mph tailwind. Plus the offline alternator. And the aero mods... and the mechanical mods...
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