As a contractor I drove a few different vehicles. I used a 95 Astro AWD (4.3L V6), a 99 Dakota (5.2 V8), an 89 S10 Blazer (2.5L 4 popper), and a 2.2L Sonoma. I preferred the Sonoma, gas wise, because it had the 4.10 rear end it pulled pretty well and used very little gas. Style, performance, and comfort went to the Dakota. The Chrysler 9.25 rear end paired with the V8 made it fun as all get out. Contractor purpose only, the Astro was a good "in between" and the AWD launches at a stop light certainly made for a fun day.
Since the vehicles were not company supplied, there were rules that had to be followed as to what could be driven. It had to be easily identifiable as a "work vehicle" and look nice in front of the customers house. Not sure if those rules still apply, but if so, I think the Festiva is out unless you deliver parts or paperwork (courier service type work). Interestingly enough, I saw one used as a "mail car" in Colorado about 2 months ago. Even painted in USPS "racing stripes" with the eagle logo on the door (makes it faster I think).
Personally, I could care less what was driven, so long as when the vehicle left there were no spots on the ground. You are only saving the environment burning less gas if you aren't polluting the environment another way. Good maintenance schedules and repairs and I think it would be cool to see a fleet of these. They would need minor lifts on the rear end to prevent a dragging tailpipe from the weight of the equipment being carried (I guarantee the springs are not made for the load).