Stop in for a cup of coffee

I have twin tractors on the farm. 1948 Case model SC, 4cyl gas, 6 volts. Still use them...
Nice. We have a 1957 model 60, she’ll, occasionally. It’s been rebuilt and has a new carb but we still can’t get it to run right. I think it’s the gas of today. It does ok on premium Rec 90, which is 0 percent ethanol and alcohol free but costs 5 bucks a gallon or more here.