But wait, there's more!
MTBE is being replaced by ethanol, after the Congress (or was it the EPA at the direction of Congress?) mandated either one or the other be used as an oxygenating additive in motor fuels.
It turns out that MTBE does not break down readily, is toxic, and is contaminating groundwater. Congress refused to renew any waiver of liability on MTBE, so the switch is on.
Additionally, COngress has mandated ethanol useage, which when combined with MTBE replacement, will bring the total requirement (projected) for this year to some 6.1 billion gallons of ethanol.
Now for the fun part.
The US, at 100%, can only produce 4.5 billion gallons of that 6.1 billion gallons of ethanol, so 1.6 billion gallons will have to be imported.
There is a tarrif on imported ethanol. Congress put that there also, long ago, to protect domestic producers.
This makes the Congressional 'profit' on a gallon of motor fuel multiples of the oil company profit on that same gallon (Federal fuel tax+ ethanol tarrif), but who gets the blame?
Sure about that?
http://www.neo.state.ne.us/statshtml/121.htm