Although my country has very strict demands on tap water quality, my wife worked at a local water department and I know what kind of fuck-ups are working there, so I’m gonna pass.
Random mutations are the least potent source of change in evolutionary mechanisms. So much so that some experts don’t even consider them as one.
Reinforcement of already existing traits through variation between individuals under environmental preasure is the main mechanism. (i.e. when food sources are high, individuals with longest reach are the fittest).
“…and if you don’t allow me to use your employee toilet and direct me to the public toilet next to the store I’ll flip my shit and start kicking the door.”
You are missing by one generation. GenX is the MTV generation that started driving after mid 90’s. Cars already started to get economical by then, at least in europe. It was those 60’s children in the 70’s and yuppies of 80’s that favored big fuel guzzlers.