However I measure my consumption in SPG. (Smiles Per Gallon)
This having an inverse relationship to MPG, more SPG less MPG.
A-men!! This is exactly what I did in response to an article I read last week on how driving at 20mph gives you better MPG (ignoring the fact that the emissions rate goes through the roof at such low speeds)
on how driving at 20mph gives you better MPG (ignoring the fact that the emissions rate goes through the roof at such low speeds) 
