It's also not just the cost of fuel, but also shedding of consumables(belts, break pads, clutch pads, etc) and frequent oil changes and other stuff.. This does balance against heavy EVs and their increased tyre wear.
In my case, I'm taking a tiny car from the early 80's and making it into a fun and cheapish EV.
Total kerb weight will be about 700-800kg.. And about for $2/100km of driving and near zero wear on any consumables.
Service every 2-3 years should be 'change gearbox oil, check break pads and fluids'.. And battery life should extend past 15 years before I'm below the 80% of original capacity.
As time goes on, conversions will come down to the point where if you have a nice car once the petrol engine blows up, you can get it replaced with an electric one very affordably and people will be buying good condtion shells and doing the conversions for resale to consumers.
It's also an amazingly good way to keep classic cars on the road. Austin Martan, Jaguar and others are already seriously looking down this path.