Link to crate motor?
I think your talking about Active Fuel Management which allows it to run on half the cylinders and come on Camaro's with automatics for the L99 engine. 400hp/410tq. Most people with the AFM disable it. L99 is similar to the LS3 but detuned slightly. The manual trans camaros come with the LS3 and has no AFM. Either way, I have not seen a YJ on here with an L99 or an LS3, I think I'll be the first. You can check out you tube, i think there might be one or two on there with the LS3. there is plenty around here with a 5.3L or 6.0L, be curious to see what there milage is but not really a concern for me, My 4.0L only gets 15 MPG at best anyway.