Should we be concerned about the whole chain of calculations he used to arrive at a wheat-field equivalent for a gallon of gas?
The interesting question is: What is the cost of burning a gallon of gasoline to society?
Pump prices have already soared to 81p per litre - £3.68p a gallon - on many forecourts.
For smaller back pack sprayers use an equivalent of 1.3 oz of product per every gallon of water.
It was announced that garages would switch to selling petrol by the litre instead of the gallon from the following autumn.
A British gallon is 5 litres, but a US one is less.
The annual price for milk per gallon was £1.17, the euro equivalent being 1.48.
That's the equivalent of about 1 teaspoon of sugar in a gallon of water.
At eight cents a gallon , that's a savings of $1.20 compared to other gas stations.
What gets the equivalent of 1,000 miles per gallon , doesn't pollute, will save the world, and transports you in breezy style?