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Originally Posted by redpoint5
Seems like STP (standard temperature and pressure) applies here when making comparisons. Though I have never reviewed EPA testing criteria, I'm sure it would include this, with correction factors for testing outside of STP.
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The SAE sells the roll down specifications and procedure for $85. Over time, I've caught snippets and yes, it has fairly extensive Standard Day processes.
About five years ago, I tried to perform my own roll down tests using a recording GPS application and realized it would take more time and effort than I wanted to spend. The GPS altitude metric and delays of low cost GPS were the biggest problem. Combined with high accuracy accelerometer data, it might work.
Quote:
Originally Posted by redpoint5
I wonder how long until the EPA busts the first overinflated EV efficiency claim?
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The folks at "InSideEV.com" consistently claim the Tesla EPA metrics are too optimistic while other EVs vary. But their procedures leave a lot to be desired such as benchmarks at 70 mph with no density altitude corrections.
InSideEV reports the biggest difference is Tesla uses the 5-step procedure of the ICE world and other EV makers use a cheaper 2-step with an EPA mandated 'engineering factor.'
With over a decade of Prius experience, I'm a little persnickety about mileage and range metrics.
Consumer Reports still pisses me off. Personally, I prefer the old Edmunds "Smackdown" series.
Bob Wilson