Im in Texas. Gas is cheap. 10000 miles means 400 gallons of gas for a 25MPG car.
Id4 will do 90MPGE in texas since electricity is also cheap here (13c/KWh). (lets assume 100MPGe)
Gas is currently $3.25/gallon
So I will spend 400x3.25 for the year for the gas car = $1300
I will spend 100x3.25 for the year for the EV = $325
Savings = $975
I currently own a 2017 bmw 330i which does 26MPG combined.
Most insurance companies charge a a lot more for EVs.
Then there is that giant risk of spending $25K for a battery after 8 years. I was planning to keep my EV for at least 12 years.
This is why without that $7500, its just not worth it. And I wont be qualifying for a rebate until I retire. AGI above max allowed. Not sure if it makes any economic sense for anyone making less than $150k to be buying a $55K car.
to calculate true cost of electricity for EV you use your miles per KWh average . For ID4 that is between 3 and 4 miles per KWh depending on the driving conditions/driver. Most local utilities will give you discount overnight electricity rate to charge (here in VA it is 5c/kwh) so 1 EV mile would costs 1.25c (@4mi/KWh ) or 1.66c (@3mi/KWh ) then multiply that by number of miles you will drive per year.
Premium gas for your BMW is $4 per gallon so at 10k miles per year that is ~$1600 vs $125/166 for electricity so almost $1500 of gas saving per year or $12,000 over 8 years, than add to that maintenance savings (no oil/filter changes/brakes/spark plugs/belts/etc), also add time savings not having to go to shop to do maintenance or fill the car at the pump ~264 times in those 8 years (you wake up to charged EV)...been driving EVs since 2014 and ownership cost and time savings are substantial vs gasoline powered car. not to mention driving experience of EV and power delivery is far superior to IC technology.
battery does not need replacing @ 8 years, it might be ~10/15% down on its capacity but should be perfectly fine to keep going. 200/300k miles should be easily achievable...