I collected some data from other Volt owners that posted their real data here. I just ran a rudimentary regression analysis to find the best predictive equation. The predictive equation is only valid for speeds of 20  80 mph.
To use the equation, simply do the % change calculation based on your typical EV range at 55 mph. The main point of the analysis is to show how big of a price the electric car mode of the Chevy Volt has to pay at higher speeds, much higher penalty than the ICE cars.
For example, according to studies backed by the department of energy, the average car will be at its advertised MPG at 55 mph. But as the speed increases:
 3% less efficient at 60 mph
 8% less efficient at 65 mph
 17% less efficient at 70 mph
 23% less efficient at 75 mph
 28% less efficient at 80 mph
But for the Chevy Volt, the penalty for the EV Range is greater:
 9% less efficient at 60 mph
17% less efficient at 65 mph
26% less efficient at 70 mph
35% less efficient at 75 mph
45% less efficient at 80 mph
My predictive equation:
% Change in EV Range = 47.11*sqrt(x)  4.58x  99.5
where x = speed, mph.
To use the equation, simply do the % change calculation based on your typical EV range at 55 mph. The main point of the analysis is to show how big of a price the electric car mode of the Chevy Volt has to pay at higher speeds, much higher penalty than the ICE cars.
For example, according to studies backed by the department of energy, the average car will be at its advertised MPG at 55 mph. But as the speed increases:
 3% less efficient at 60 mph
 8% less efficient at 65 mph
 17% less efficient at 70 mph
 23% less efficient at 75 mph
 28% less efficient at 80 mph
But for the Chevy Volt, the penalty for the EV Range is greater:
 9% less efficient at 60 mph
17% less efficient at 65 mph
26% less efficient at 70 mph
35% less efficient at 75 mph
45% less efficient at 80 mph
My predictive equation:
% Change in EV Range = 47.11*sqrt(x)  4.58x  99.5
where x = speed, mph.
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