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You could just about break even.
Since you drive a lot of highway miles you are better tailoring the engine set up your use.
If you did all city driving you would want to leave the stock size pully on.
My metric on weather or not I do a MPG mod is $250 (absolute max) per MPG.
I like to spend $200 or a lot less if possible when picking up an MPG.
I will also spend $20 per horse power (as long as it doesn't effect low end torque or fuel economy). Or up to $20 to pick up each ft.lb of torque on the low to mid range only.
I like to spend a lot less if possible on these too.
So $130 for a possible 1MPG, yeah I would do it given the low price and unproven pay off. I think driving tons of highway miles you have a better chance of pay off.
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