It's weird, how this stuff works.
I was returning to my home field in the summer of 2016 and developed a very rough engine at anything more than 60% power. Below that it was OK.
At 4 miles to final, it started getting worse, so I contacted the tower to let them know I had a rough engine, and one passenger aboard.
I told them "No emergency". I was either going to make the runway, or it would be the Department of Transportation's problem as there is absolutely nowhere else to go but the highway.
The engine quit when the wheels touched down, I coasted off the runway, and surprise, it restarted. I taxied back, filled out a squawk sheet and went home.
Six flights later, I had performed five engine out landings. They couldn't figure out what was going wrong. The manufacturer finally sent a rep/mechanic who discovered that some hose was flexing and choking off one of the carbs.
I never got a call from the FSDO. Not one.
Fast forward a year and a little bit.
A couple months ago the engine in the Cub quit while I was in the pattern at a non-towered airport. Old 65hp engines with wooden props don't like to go slow in cold weather, it's just a fact of life. I didn't even have to shorten my usual approach by more than 100 feet to hit my "spot".
I got out, pulled on the prop and flew for another hour.
I was home within 2 hours of the "incident", and the FSDO had already called my home phone.
They didn't offer up how they knew about the "incident", or how they knew I was flying the plane, and I didn't ask. The conversation was very cordial, and lasted less than 10 minutes.
I think it twisted them a little bit by not asking.