27.9 cents a gallon. That would make you older than me :) We sold fuel at our lil country grocery store. I remember dad adding a tank & pump for unleaded and a few years later the switch to regular unleaded. It was about the time cigarette taxes were going up about every six months. I remember people swearing they were going to quit when it got to a dollar a pack. But very few did. Good for you with the boat & road runner. Today that would draw a crowd to watch you use the road runner at the boat ramp to launch the boat. I still have the 87 Buick grand national that I bought new.
Built a 509ci Cadillac for in an 87 Olds 442. Always wanted to use it to tow my 87 Buick Grand National to car shows but never got to. Strong as I had that 2004R transmission built up it wouldn't of liked it. The Cadillac power forum I frequented over the years had several members who had 350/454 pick ups that they replaced with 472s & 500s. Many claimed they both towed better and generally used less fuel.
Also had a neighbor when I was a kid that towed a TT and his lil speed boat with his Olds 455 wagon. He used them big Rectangular strap on mirrors that was common on pick ups of that era. Come to think of it he had an Olds 455 in his 70s jet boat.
