I don't get it, sorry. The difference in gas is what...lets say it is 20 cents between 87 and 91 octane, given a 20 gallon tank you'd save a total of: $4.00

Is that worth it? Even if you filled up every week, you'd save about $18.00 a month...or 216.00 a year.

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"promote the general welfare, not provide the general welfare"

We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America.