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Discussion Starter · #1 ·
... and the MPGe rating also increases from 94 MPGe to 98MPGe... still shy of the magic 100MPGe....

http://www.gizmag.com/2013-chevy-volt-range-price/22872/
 

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SoCalGuy said:
... and the MPGe rating also increases from 94 MPGe to 98MPGe... still shy of the magic 100MPGe....

http://www.gizmag.com/2013-chevy-volt-range-price/22872/
One of the interesting technical points i read in one of the articles about the Volt is that they are drawing down the battery more (and leaving a slightly lower reserve) based on the data from actual use that shows that the battery will not be harmed. I am hoping Fisker will also be able to let us use more of the battery and get more performance by relaxing some of the limits.
 

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I wonder if they will change the way they calculate the MPG for the EVER cars at some point. My real world experience is 150 MGP; which from what I've read here is closer to most owner's experience than the official calculation. (A first for me to get better real world MPG than advertised!)
 

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EVer1 said:
I wonder if they will change the way they calculate the MPG for the EVER cars at some point. My real world experience is 150 MGP; which from what I've read here is closer to most owner's experience than the official calculation. (A first for me to get better real world MPG than advertised!)
The real world MPG is highly dependent on your driving distance, speed, and the availability of charging opportunities. It would b difficult to come up with a single test that replicates all the ranges of these parameters. The best they can do is to come up with a sufficiently diverse test that covers the different driving regimes and then use it a relative, not absolute, measure to compare cars with each other. I don't think we will ever stop hearing the phrase "your mileage may vary."
 

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Discussion Starter · #5 ·
The MPGe rating is based on how much energy is used to travel a certain distance. The EPA says that the Karma has an electric range of 32 miles using 20kwh of juice. That equates to approximately 1.6 miles per kwh. A gallon of gas contains about 33kwh of energy, so the "MPGe" is 1.6 miles per kwh times the 33 kwh in a gallon of gas = 52.8 MPGe. The only way this rating would change is if the EPA testing got more than 1.6 miles per kwh.
 
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