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I've already thought about this being applied to a vtec engine or others that employ different sets of cam lobes...I'm sure the "low cam" could be ground with less lift and duration to provide more low end torque and better mpg, while still retaining a high power lobe for top end. There would be a bit of a flat spot in the midrange but I'd put up with it for the mpg gains.
Doing this to a regular engine would obviously be at the cost of horsepower but regrinding the lobes smaller should be fairly simple as no material has to be added to the cam like when they make larger more agressive ones.
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