EVs Fail To Meet EPA Estimates More Often Than Gas Cars: SAE Paper

As a result, the range estimates are inflated in favor of EVs, making the ratings harder to match in real-world highway driving. A solution proposed by the paper is to publish both city and highway range figures – as it already happens with fuel-economy estimates for ICE vehicles – so that shoppers get a more accurate picture of a vehicle's efficiency.Car and Drivercarried out at a constant 75 mph, the EPA's cycle is variable, with the speed increasing and decreasing during the test.

This favors EVs, which are able to regenerate energy under braking, to the detriment of gas vehicles, which tend to be most efficient at a steady rpm. Obviously, it leads to higher range results for EVs. 's 75-mph test, with the initial EPA results then multiplied by a reduction factor to simulate the effect of higher speeds.

The reduction factor is another issue highlighted in the paper. Automakers can choose between running a two-cycle test – where the data is multiplied by a standard 0.7 adjustment factor – or a five-cycle test in an attempt to earn a smaller reduction factor, resulting in a higher label figure. A consequence of that is the range figures aren't perfectly comparable across different vehicles. The authors of the paper propose thatMore stories on EPA driving range estimates for EVs

Source: Car News Wire (carnewswire.net)

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