I imagine they're getting downvoted because, while it's technically true in the short-term, it's a terrible idea. If you're trying to do an apples-to-apples comparison between electric and gas, unless you're going to measure and calculate the fuel efficiency loss, it makes no sense here.

If you're paying for a higher-end car, it makes no sense to cheap out $.30/gal. Fuel costs, especially the difference from regular to premium octane, are so little in relation to everything else. While anti-knock sensors should avoid short-term damage, the long term effects aren't known [1].

[1] https://jalopnik.com/why-putting-regular-gas-into-a-car-that...