As a designer, I can offer color theory and some subliminals. There is a fundamental thought in design that is this: If you emphasize everything, you have enphasized nothing. I believe there is too much competition of color using the yellow. If you had to choose, what part of your car do you want to stand out most? I actually really like the yellow, but my eye keeps going to the wheels. Is that where you want people to look frequently? Bright yellow draws a lot of attention, like as in a fire engine color.
I suggest against the green. It is too much green in my opinion. (This is just an opinion, not a design theory thing).
The straw is nice because it is different, but it doesn't scream 'look at me'.
Personally, I'd go with black (I think). It will, by the above principal, really make the body of your car pop. Id try a mockup of that and see what you think.
my 2 cents. Good work doing the mockup. It really allows you to make a good decision, which in the end, the winning answer should be what you like best, regardless of color theory.
Tom