Originally Posted by SCORE-Cash

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.