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The cheapest way to change your final drive is to fit larger wheels.
Going from 14" to 15" will give you about 8***37; better economy at cruising speed but you will also get a corresponding decrease in performance.
So, in the end you will give it more gas pedal and not save any money.
Another solution, if you haven't done it already is spend a few bucks and take it to a mechanic who knows his stuff and and have it sorted properly.
This will probably save you money in the long run and a good mechanic will also tell you the jobs you can do yourself before you get him to do the expert bits.
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