Fuel Mileage Oil Types Radio Questions and More

1.2019 Ford F150 with a Canada Speedometer wants to switch to US. 2. 2018 GMC Why is my Low Coolant Light on. 3. 2015 Lincoln MKC with block crack. 4. 1999 Suburban engine misfire. 5. What oil should I use in my 1936 Chevy? 6. My radio failed in my KIA Optima. 7. 2021 Ram V6 gets bad mileage. Is it normal?