Intellectuals can do the math until they are blue in the face. All that matters is real world application.
An EGo 56V 7.5Ah battery will almost mow my lawn on one charge.
Previously a Snapper Ninja 21SP mower with B&S engine could almost mow the lawn on 38 oz (1.2 quarts) of gasoline.
56 * 7.5 = 420 Wh, it probably doesn't have that much, but we'll use this number anyway. And considering I stop before the battery is fully discharged.
Will allow 15% charging losses. So
0.420 kWh * $0.010/kWh * 1.15 = $0.483
At $0.10/kWh it costs $0.483 or 4.8¢ to mow the lawn.
At $3.249/gallon the cost is $0.9747, or 20 times what the battery electric got the job done with.
EPA tries to pull a similar game by rating EVs with "MPGe" based on the kWh heat content of gasoline vs kWh from the power grid. An intellectual game, doesn't matter in the real world. In the real world we understand MPG$, the cost per mile for fuel. I've said it many times, the dollar is the only honest metric of resource consumption. Every man demands fair payment for every contribution toward the final product, these payments accumulate and are reflected in the final price whether it is gasoline or electricity.