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I had both the 2.2 and the 2.5 and observed the same fuel economy for both engines even though the 2.5 has more displacement. I actually prefer the 2.5 but I will keep my 2.2 since it is in perfect condition and has the pre swirl head pistons and head.
I am not concerned with a loss of high RPM power with a shorter duration cam. My car already has a custom programmable logic module, water injection, and an intercooler. A small loss of power will not be an issue. I am simply trying to figure out what kind of fuel consumption will be observed by going to a shorter duration cam. I found a wrecking yard in my area that is willing to sell a roller cam and followers for $25 but it sure would take a long time time to amount to $25 in fuel savings.
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