New Zealand didn't go to unleaded until the '90's, and lots of drama too of course. First it was the regular grade, and one of the things that happened was cars were catching on fire, and it was because of that unleaded fuel ! But it was the same cars that always caught fire - Ford Escorts, Vauxhall Vivas and VW Beetles...the fuel hose would come off and squirt on the ign coil. We had a guy who filled his BMW up with this new fuel, took it home and it wouldn't go again. He blamed our fuel, we were going to have to get his car, remove the fuel, get it running again and fill it with real fuel...and we were going to have to pay his bill ! I found the needle valves were pressed into the carb body, not threaded...and they had fallen out. The things this horrible unleaded fuel could do to your car were endless.
In the late '90's premium went unleaded, and this was a big one, because real cars ran on premium...were were calling it 95 by now, the regular was now 91. I had a Ford Falcon at the time with a 250 engine, it wouldn't run on 91, and would rattle it's head off on 95, I had to run it on 98, but not many stations had 98, so had to use octane booster if we could't find a station with 98. It had run fine on the leaded 95.
We had no emission laws, cars for NZ had no cats, no EGR, we didn't need that stuff so it was stripped off to make them cheaper. We still have no ethanol in our fuel, just one brand has it in it's 98. The biggest thing I noticed with unlead was shelf life...if the engine sat around for a few weeks or months it wouldn't start again. So for the last 20 years I've turned my fuel taps off on my motorcycles and run the bowls dry, and will start with fresh fuel in the carbs.