Might as well finish-up my thread derail.
Yep; back in the 70's, when we had good ole leaded, real gas - remember Ethyl? - it was normal to leave gas in carbs and (over 6 months or so) no varnish would form. Then, in the mid '70's unleaded came along and you had 5-6 months max. before it started to gel. Then, in the early '80's we got reformulated gas and the shelf-life became 3 months - maybe - and cleaning carbs became a common thing in the spring. Now, we got that and ethanol too; adding corrosion to the mix.
I run "Rec gas", but also add stabilizer in the fall and drain carbs for storage - reckon I'm just anal