[Formulajones]

I think you meant to say the gas nozzles are smaller now. The old leaded nozzles were larger, and the unleaded cars coming out at the time had the filler necks with a reduced hole so that the larger leaded nozzles couldn't be used in the unleaded car.

It was very common to knock those out for those that wanted to run leaded fuels in their unleaded cars, when it was still available.

These days all nozzles are the same size now since everything is unleaded.