I asked because back in my textile mill days ( 30+ yrs ago ) the old guys there believed white concrete driveways would cause the exhaust pipes to rust away faster than a gravel drive. I always wondered if that was a wives tail of sorts.
My dad had tail pipes and such replaced almost yearly. His daily commute was about 4 miles each way. Large numbers of workers lived wihin a few miles from there jobs back then. Local muffler shops stayed busy.
