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In regards to the Enclave I don't think it's aerodynamics as much as it is weight...

Okay, thanks. I have spares so certainly worth a switch.

My father had a 2017 Lacrosse with the 3.6 V6 in it and during the short time I drove it before selling, I averaged over 30 MPG on the highway. Truly an issue of aerodynamics in comparison to the Equinox or the Enclave. Pretty awesome engine, IMHO...

I had the 3.6 in the Buick Enclave [now gone] and the best we ever got for fuel mileage was about 23.5. I think the MPG could have been better but the RPMs were always higher. My wife's vehicle is now a 2018 Chrysler Pacifica and always gets higher gas mileage then the Enclave.

Most houses built here just rely on a lot of foundation waterproofing and french drains made of plastic pipe with holes, covered with gravel, below the footers to carry water away from the house before it gets into the basement or crawlspace. I'm sure there are people in this area that need sump pumps but I don't know anyone that has one.

I think it is called a PCM on the Equinox but I'm not sure. A black plastic cover has to be removed and the silver box is underneath. You can just see the negative post of the battery peaking out on the right side of the computer and the hot post of the battery is under the computer. If you want to jump start the battery you would have to use the remotely mounted stud for the hot post that is under the red cover behind the PCM. I did connect a 12 volt battery to the cables to keep the computers awake while I swapped the batteries so I didn't have to reenter the all the settings.