Currently its been 8 to 10 years since I've had a flat. I had a steel belt rupture inside the tire while going 70 MPH down I-95. I was able to safely pull over and stop, took the spare out, and changed the tire.
Now I've had nails, screws, and other stuff stuck in tires, and had to get them removed and patched, but its never needed roadside attention.
Do you mean a flat that requires roadside repair/assistance?
Or do you mean any sort of puncture?
I seem to pick up a nail or screw every 3 to 5 years, but those don't leave me stranded, they just leak out slowly. I only had to stop and change a flat on the side of the road once about 18 years ago.
I also drive without a spare tire. Instead I carry a can of instoflate sealer/inflater.
Probably an average of once or twice per year I have a puncture that doesn't need roadside attention. I had one a month ago, and I remember plugging one in my yard last summer.
I can't remember for sure when the last time was that I changed a tire roadside. It might be 3 or 4 years ago when I ran over a curb near NYC that was taller and sharper than I expected. The tire sidewall was wounded badly but not leaking, and the rim was dented. I was unable to get the lug nuts off, and the only garage that was open was Pep Boys; they did me a favor (thanks guys!) and loosened them, which took quite a lot of time with their biggest impact gun.
Before that (probably 2 years before) I tore a sidewall on a rock wall when I got too close while entering a driveway.
Before that (probably another 4 years) I had a tire blow out on the highway (I was doing 105mph and the tire probably wasn't inflated well).
Somewhere in between those last two, an unexpected difficult-to-see pothole or raised manhole cover (I can't remember) in a construction zone destroyed one of my tires.
Patience and more responsible driving would have avoided most of those ones that I can remember. I'm pretty sure there were a couple more. I have always driven a LOT of miles -- these days I drive less than ever.
never had one require changing myself in the...6 years I've had a license. I do have a nail in one of my summer tires that I need to have fixed before I swap them back on but it loses about 20 psi per year (out of 50 that I have it at) so I just check it every month or so. it's also a SSW run-flat.
that being said, I've got a spare in both cars cause I work in a shop and do half a dozen repair or replacements a day.
1991 Toyota Pickup 22R-E 2.4 I4/5 speed
1990 Toyota Cressida 7M-GE 3.0 I6/5-speed manual
mechanic, carpenter, stagehand, rigger, and know-it-all smartass
"You don't get to judge me for how I fix what you break"