Diversion time is necessary to accurately account for the difference in time had you not stopped for fuel vs the inconvenience of stopping for fuel.
"Gas stations are on my way to anywhere" doesn't change anything. It still takes time to turn off the road, and return to the road. An EV would start every morning with a full charge (or whatever charge one designates) and would never need to be topped off during a normal day.
Yes, include diversion time for EV too. Such as the time to park at home where your EVSE umbilical is located that takes an additional 15 seconds to attach and another 15 seconds to detach.
In years past driving I-65 a stop at the Supercharger in Bowling Green, KY was necessary to get from Nashville to Louisville. Located a good bit off the interstate, a 20 minute detour. Today one can charge just north of Nashville and again in Elizabethown KY.
Oh my, just think of the extra consternation of having to use a computer or cellphone to post on TBN!
Click the right roller wheel on the Tesla steering wheel and say, "Navigate to Barber Vintage Motorsports Museum Leeds Alabama" and everything is taken care of for you.
I have always said to include everything.
But that is your imagination. Just think of the consternation in deciding which gas station to stop at! Don't want to buy gas at one then 2 miles down the road find another has comparable gasoline for $0.30/gallon less! Break out the cellphone and GasBuddy!