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Old 08-15-2009, 12:44 AM   #2 (permalink)
bwilson4web
Engineering first
 
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Join Date: Mar 2009
Location: Huntsville, AL
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17 i3-REx - '14 BMW i3-REx
Last 3: 45.67 mpg (US)

Blue Bob's - '19 Tesla Std Rng Plus
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I was able to go back and this time record mileage. At 2:00 AM, I was able to run a 50% power run too:

power miles MPG mph
100% 1.5 23.8 35
_75% 1.5 25.3 26
_50% 1.5 22.2 16


On the descents, I simply put the car in "B" and let gravity and the spinning engine do the rest. But I noticed the battery fully charged and the top bar, slightly pink, was illuminated.

I returned to my starting point, about a mile away from the base of the hill and the battery was still fully charged. On the second run, the battery charge still showed full as I approached the base of the hill. I suspect this is why the middle run showed exceptionally high mileage, a battery boost.

For the last run, I used "EV" mode to bring the battery out of the 'pink bar,' full charge and then used regular "D" to approach the hill. Until there is a standard way to normalize the battery charge, I won't be able to trust this data.

To handle the battery energy contribution, we need to measure the traction battery current. Then comes the challenge of trying to use the charge/discharge energy flow to compensate for the altitude and distance.

Bob Wilson
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2019 Tesla Model 3 Std. Range Plus - 215 mi EV
2017 BMW i3-REx - 106 mi EV, 88 mi mid-grade
Retired engineer, Huntsville, AL

Last edited by bwilson4web; 08-15-2009 at 12:54 AM..
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