just to stir the pot, If this "OPTIMIZED" camshaft could produce an increase of one mpg, from 16 mpg to 17 mpg, with gasoline at $3.50/gallon. It would take about 15.5K miles to recoup the $200 dollars. A 10% increase in gas milage would make it go from 16 mpg to 17.6 mpg which would then cause the break even point to be at the 10.1K marker. In the second instance, you would have to travel 20.2K miles before you could say "I've saved $200 dollars" because you spent the $200 to switch cams, you then "broke" even at the 10.1K marker and at the 20.2K marker, you have then actually $200 more bucks in your pocket. Sometimes saving money, costs money, how much can you afford to save?
