"Let's waste time. Chasing cars in our head". I think it means at he loves to waste time just by imagining great moments with that certain person. Imagine things or Happy thoughts which he is not sure if will happen. I so love this song. This song is like the narration of how love is going on in my life. I'm empowered with just the thoughts of that person beside me. Every time I lay down, he'd be the first person to buzz my thoughts. "I chase cars in my head" I had this fantasies making our stories cause I know that's just where we could be happy and with mutual affection. . "I need your grace To remind me To find my own" But sometimes I wan't to be in the real world. I want to remind myself that the two of us is a hopeless case, very impossible.