Originally Posted by sheepofblue
I suspect it has a lot to do with usage.
For instance the load you are putting on across MS per mile does not match someone running the hills just east of you pulling a trailer. Add in driver habits on speed and pedal habits. Then there is also the definition of 'bad'. The picture of yours says to me you went at least 10K to far for optimal performance.
However if it was good enough for you fine. I will compare that to my bikes. I change brake fluid in the race bike at least once a year and usually twice. The street bike every 2-3 years. On the street bike brake fade is not an issue (if it was I should settle down
) while on a race bike I have had them fade on more than one occasion.
Of course I would have likely went the 70+K on my RV like you did
I agree that usage could be a factor, just as driving habits may be. However, those 70,000 miles on the OE plugs were done all over the US, including the rocky mountain states and CA 3 times. Most of them were highway miles running at least
60 MPH, towing a Vue. Perhaps THAT helped keep them clean and serviceable, I really don't know, but I doubt that Flying J 87 octane gas deserves any credit.
The current chassis with 43,000 OE miles has been from the Key West to the Columbia Ice Fields in Canada without a hic-up and the MPG has remained at 6.4 since new, so I don't see any need to "fix" what ain't broke". OEMY will tell you- I'm CHEAP, but I prefer to think I'm just not willing to replace working parts while they are still working, PM excluded of course.