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Even if it's a 4% gain at your typical speeds, it's still a significant gain that'll pay for itself in no time.
If you drive 10,000 miles a year at speeds that will net that 4% improvement, that's 19 gallons not burned: 513 gallons vs. 532 gallons. (19.5 mpg vs. 18.8 mpg)
@ $2.75 a gallon, you save $52.25.
So your mod starts giving a healthy return on your investment early in year 2.
And that's a conservative estimate of fuel prices. I'd be willing to bet it's going to be much more than $2.75/gal in the US in 8 or 10 months.
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