> Based on numerous studies
I do agree the relationship probably isn't linear, but the fourth power rule doesn't necessarily have numerous studies confirming it. It was a small collection of studies on road wear the US highway administration did in the 1950s and pretty much everyone has just gone with that. Other studies have pointed to it being less than previously thought.
https://discovery.ntroknowledge.com.au/discovery/fulldisplay...
Throwing even more weight against your 12,000mi is really 35,000mi equivalence.
Thanks for the insight but my claim was never "12,000mi is really 35,000mi"
Regardless, it would be interesting to see the actual number worked through to see what the equivalent EV registration fee should be if road damage/maintenance is the sole factor.