Chris,
PM me. I may have someone who will fly with you.
On the issue of mogas (auto fuel), DC9 is correct about the legality of the STC. However, auto fuel is unstable, doesn't keep well, decays, and leaves deposits and gum in tanks. Most mechanics (myself included) are very leary of running auto fuel in airplanes. The Cessna 150 (and the 0-200 in general) did quite well on auto fuel. However, many other engines are more likely to experience problems over time with use of autofuel.
Airplanes which are flown irregularly will experience the most problems from the fuel simply sitting in the airplane, where it deteriorates, separates, and goes rancid. The chemical composition of the fuel changes and it decomposes. It is damaging to seals, bladders, filters, etc. It is hard on ejectors, especially if not frequently rotated, or used and replaced with fresh fuel.
Avgas, by comparison, has been found to be good after 50 years of sitting.
Autofuel has a very wide range of formulation and quality. Additives vary considerably with autofuel. Not so with avgas. Autofuel produces sludge and varnish in fuel systems, lacks necessary valve lubrication, etc. Plus, it stinks, especially after sitting in a tank for a time. Small, low compression engines can do very well on mogas, but many aircraft engines won't, including many of the popular 0-320 series. This is to say nothing of the fuel systems in those airplanes, which suffer from the lack of aeromatics in the fuel for lubrication, and the emolients necessary to preserve bladders, etc. Don't forget the potential buildup and damage to items such as selector valves, fuel sending units, etc.
The EAA did some great work in promoting and researching the use of mogas. However, that effort was motivated by economy, and in many cases, economy shouldn't be the top priority.
BTW; the cherokee will do fine out of SLC. Are you looking to have others do instruction in the airplane, too?