that era was special for the OPEC oil embargo. The Arabs were punishing the US for supporting Israel, so they were restricting oil to the West. So we had gasoline shortages. We had all kinds of economy fads going on. I remember seeing Mopar had an option on their cars, whereby if you stepped too hard on the gas pedal, the engine vacuum would drop, and it would trigger the left fender-mounted turn signal to flicker, reminding you to not be "fuelish". LOL.