I like to say that gas is currently cheap because anywhere you'd want to drive to spend money has become too fucking expensive.
As for EVs reducing demand, ChatGPT estimated that if all of the roughly 4 million EVs in the USA were magically transformed into ICE vehicles, the price of gasoline would raise by about 1.3%, which is well within normal market fluctuations. So no, you don't really have to thank us EV drivers for cheaper gas.
At least now I know that my own individual contribution in lowering gas prices by owning an EV is roughly one-hundred-thousandth of a cent per gallon. You're welcome.