Canada gets 0w-20 also.
It sounds like you're just repeating what the guy in the video said. Pre-Skyactive would have been when Mazda was partnered with Ford and using Ford parts. I think a reason that OEMs say use 5w-30 in other countries is because 0w-20 might not be as available there
For...
$25,000 in 2013 would be $35,500 in 2025 dollars. The current Select trim is closest to your 2014 Touring and has an MSRP about $31,500. Seems like the price hasn't increased as much as inflation
It does sound like parasitic draw from some module that's not going to sleep.
Do you maybe have a phone charger plugged into one of the always-on ports?
from the 2013 owners manual:
Tire Pressure Monitoring System
Initialization
In the following cases, system initialization must be performed so that the system operates normally.
A tire pressure is adjusted.
Tire rotation is performed. A tire or wheel is replaced.
The battery is replaced or...
If fuel dilution is a problem, it's an issue with the engine not operating correctly or the sample being taken after lots of short trips and not getting the engine up to temp
Here is my oil test @ 7k mi from 3 years ago on page 23. Oil was regular Idemitsu, not high moly