Pretty darn funny that all of the cars on the road today are running pretty darn good on the modern fuel.High performance and all.Engines running upward of 500 horsepower,and your old 216 sixes wont run right on the same fuel.Something not right here.My 350 CU.in my 55 and my 500 CU in. Caddy in my 65 run just fine.Oh yeah and thats on modern low grade fuel.