It is difficult to regrind a cam for economy if the factory did not studied and manufacture an improved camshaft already because it does require a huge amount of testing.
"Atkinsoning" camshaft is only suitable on twin cam engines.
On non performance engines, it is a high probability that the camshaft is difficult to improve upon.
Maybe a little more exhaust lift and duration to purge the cylinders more efficiently.
Maybe a little less inlet duration at the expense of top end power.
I would not do it unless there is a known alternative timing based on that particular engine ...
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