

Not necessarily, it can mean disabling aircon, driving the lower speed limit, taking a flatter route, etc
It’s not always about quality or performance, you want cars to be comfortable too, which is why you have to make tradeoffs. One thing hypermilers sometimes do is taping the seams on the hood, door, etc to improve aerodynamics. You could make a car from factory without seams in the body, but you won’t sell very many unless you can convince people to crawl in through a window.
Other things may be prohibitively expensive, or not durable, so you make tradeoffs. As efficient as possible while staying within the chosen price class and providing a certain standard of comfort.
Attraction isn’t really exclusively based on sex, though. It’s about a whole range of factors, including how someone presents their personality and their physical traits. Many trans women have a lot of traits people find attractive in women generally, so being attracted to a trans woman is consistent with heterosexual attraction.
This means that liking trans women doesn’t automatically mean you’re attracted to men, so calling it gay is an oversimplification of how attraction works.
You could argue that in a strictly biological sense it is homosexual, but that ignores a whole range of social factors, which isn’t really how the term “gay” is colloquially used.