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It's not worth it.
1) My PT doesn't do 28 miles to the gallon. 16 to 18 at best.
2) Secondly, based on the current price by my house of $3.90 a gallon the savings would be $387.985 a year.
Gas would need to go to $5 today, so that in three years you would get back the $2,500 back.
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