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Guess-O-Meter or Accurate Range Display?

3555 Views 21 Replies 13 Participants Last post by  Palouser
I see some refer to the Volts range display as a Guess-O-Meter (GOM). My range display is pretty darn accurate, so why do some refer to theirs as a "GOM"?

I suspect the issue is based on the driver not understanding (or forgetting) things that affect car range. The car's range display is based on the drivers last few trips, and it is basically saying, "Based on the last few days of driving, you should get this range, all things being equal."

That last part is important, if conditions change, the estimated range will be off. This is where people get tripped up.

Changes in condition include:
  • Tire Pressure. Low tire pressure will decrease range. It's very easy to loose 2-3 or more PSI when the outside air temps drop.
  • Weather. Cold, wet, snow will all decrease range.
  • Heater/A/C. Cranking these up will decrease range.
  • Aggressive Driving. The more aggressive the driver is in starts and stops, the more the range will be negatively affected.
  • Speed. Speed kills ...battery range. The faster you drive the more it will negatively affect the battery range.
The effective range of the car can drop (or increase) based on changes in the above compared to the previous days driving record. I think some people forget that, leading to calling the range display as GOM.
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My only comment is that I would be surprised if it uses more than several minutes of driving history (rather than potentially 5 charge cycles) to update the display. My drive in to work is a net loss of ~800' over 10.5 miles. Many times I will start out with an estimated range of 40-43 miles. By time I get to work, the estimated range remaining is often in the upper 40s, or pegged at 50. On my way home the estimated range drops precipitously, especially in the last 3 miles where I go up the steepest part of the drive. In my ten mile trip home, the estimated range will often go down by nearly 30 miles, thus I conclude the update to the range is looking at the most recent very high kWh/mi needed to climb the hill home and updating accordingly.

In the end the overall range that was reported in the AM (about 40) is usually pretty close to what I observe (about 38-40 miles if I do not recharge). Of course this may be an early 2011MY programming that was smoothed out in later models? Mine has a low 004xx VIN #.
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