I'll post this on the poll thread too. Biden said he'll contract a disease and Kamala will take over. Wtf. He also said he created the largest most diverse voter fraud organization. He accidentally tells the truth I assume due to his lack of mental capacity.
Jack up the rear tires. Turn a tire by hand, on an lsd with good function the wheel won't even turn if the trans is in park. With a worn out one it will turn AND the other wheel will turn the opposite way. That's quite worn when they do that.
You may want to start it and wait a few minutes so the guage can work it's magic with 14 volts instead of 12. Sometimes you'll see a different reading that way. Also maybe it wasn't quite full? If it really evaporated it's just something to live with.
I had a silve-Ray-doe 2500 with hydroboost and those brakes were stupidly powerful. Also the roadmasters had them. I never tried a g body conversion though. Plenty of cars have powerful vacuum brakes too. All about the rotor size and pad selection and caliper. ( Lol all about the system...
Everyone is different, so here's my .02. I'd fix the floor in the roller and swap your engine and trans into it. Keep the hit car somewhere nice and dry for later use or fixing. Keep them both. Drive the easier one to fix.
For that rig and tires I think you're doing ok at 12mpg. It's prob heavier than most people think. If you're fuel injected and it's running right the only way to really improve mileage is to drive like Gramma. Low n slow.