[aardvarcus]

Thank you all for all the suggestions.

The Suburban has already been swapped to dual 18” Thunderbird E-Fans and a NBS Duramax alternator. Alternator has way more amps at idle now. I had designed a two piece tail, but it wasn't going to get me where I wanted so I have decided to hold out and do major bodywork tapering instead.

I pulled some rearview mirrors off an Audi A4 at the junkyard, but I think I may hold out for some even better aero ones.

The vehicle now has the "work truck" front end off of my Chevy parts truck, with a conveyor air dam under the bumper. Got a GMC grille waiting to correct the brand labeling. Attached is a more recent photo for context.

My last four tanks before I slowed down on driving it were all 24 to 25 MPG. With a 1000 mile range I haven't had to fuel it up it since spring.

I don’t think the water or methanol will help me much as I am naturally aspirated, so I am not seeing excessive combustion temperatures to combat. As I have a new-ish 2010 GEP Optimizer under the hood, I don't want to risk any engine damage.