Guys,
Your loss of milage is due to the clean air act requirements that normally show up in winter, with the temperature inversions. MTBE,Ethanol and other oxygenating agents "helps your community stay under the maximum allowable limits for CO emissions".
We had MTBE for two winters here in Anchorage, mileage went down and many complained of headaches. The state and feds got the message and now we have 10% Ethanol by weight added to our gas,instead of MTBE- not to mention anyone living in town must get an emissions test to get new tags. I experiencd a 10-15% loss of mileage.
H
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