Actually, he is using gold as a symbol for success and happiness, but in this song and this line in particular, he is saying that everything is gold so everything and everyone is equally as happy and successful. In his eyes, this is a perfect world
I think it’s just him not caring about the gas mileage or the mileage already on the car. He loves the car and nothing will stop him from cruising in it?
I agree with PACS ^
It’s not just a sunny day, but everything in the world is equal by being gold, and Macklemore is loving it