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negative cost for mile is only possible if you "ignore" certain real costs as no value OR your paid :-)
"as price of fuel goes up, consumption goes down. "
this is very much FALSE in the traditional sense of thinking.
there is a minimum ceiling for which it "CAN NOT" go down no matter how expensive (within reason) fuel gets.
for example. even driving my metro I "MUST HAVE" no ifs ands butts no negotiation no discussion no compromise no choice.
I MUST have 1 gallon of fuel for each trip to and from work. so 2 gallons each time I goto work.
this is non negotiable. $1 a gallon I need 2 gallons $10 a gallon I need 2 gallons. Period.
I can "not" goto the movies I can "cut trips" to grocery store. but I can not "cut trips" to work
so even in crunch bare minimum tighten the belt mode I MUST expend 8 gallons of fuel per week JUST to goto work.
without work nothing else happens. non negotiable.
this is partially why standard concepts of supply and demand really do not APPLY to gasoline and they know it.
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