Gasoline engines are far cheaper than electric drives. I'm not sure where you've come up with electrics are cheaper, but here's a comparison for you: For example, a crate engine for my car is about $2700. https://www.summitracing.com/parts/vre-dfn9/make/ford An electric drive for a Tesla S is $12k - are these even real? Who knows if your car will accept the transplant. You've certainly voided the warranty. https://www.evwest.com/catalog/product_info.php?cPath=8&products_id=476 If you check that page, you'll see that non-Tesla drives are still 3K and up. The cheapest is a 48V 35HP motor. That's an electric factory truck. Most of the electrics on that page aren't rated for road use, they're open to the air. Tesla has a lot of problems even supplying repair parts for new cars. Do you trust them to replace your drive in 15 years? https://forums.tesla.com/discussion/77550/replacement-parts-why-are-they-impossible-to-get I'm an electronics tech. Circuit boards are "not easy to replace." Electronics in cars are usually buried in other things, but the nice thing about gasoline engines is that many of the systems can die or go funny and the car will still run - albeit badly.I currently have many systems on my 2007 Focus disabled because they died. Does the engine computer care? Yeah, but it just throws a code and life goes on. Tesla does things like uses consumer-grade flash (why is there even written flash in a car?) that wears out and soft-bricks systems. https://www.tuxera.com/blog/tesla-troubles-averting-automotive-flash-memory-failure/ That's a rookie mistake. If you constantly need to write things to a drive then it better be a SLC with some massive wear leveling and can be easily replaced if it dies. Batteries are a theoretical maximum, and Tesla begins limiting your charge rate after a while, suggesting the battery has degraded far in advance of 300,000 miles. This type of battery isn't rated like that, it's rated in how much charge it's taken. Once it's taken so much charge, the battery is considered "degraded." Consumers equate that with time, but that's only because most devices don't measure the charge amount given vs. time. https://electrek.co/2017/05/07/tesla-limits-supercharging-speed-number-charges/ I remember the 20% you're quoting. That was one car. Tesla called the 22% degradation "aggressive." But that was also only a few years of use. Was the degradation due to charging, or age? The article didn't say. Are you going to have that after 12 years of hot and cold? 20? I've seen plenty of gasoline cars run with little to no maintenance other than normal stuff if you run them for 200,000 miles in 3 years. My current vehicle is 12 years old. Other than normal maintenance, I've replaced an alternator. That's an electric motor in reverse, and it died. https://electrek.co/2018/07/17/tesla-model-s-holds-up-400000-miles-3-years/ Electric motors still wear out. Sealed bearings dry out. Depending on what kind it is, brushes wear out. Enamel on the windings flakes off. Get a little road salt in there and the whole thing is toast. The commutator drives die if it's a brushless drive. We have well over 100 years of knowledge on gasoline engines. We barely have 20 on modern electrics, as the previous generation of EVs were nothing like what we have today.