well, i dont know if its cuz simply an empty tank, yesterday she was barely below half, ill say 1/3 to the bottom even, and she still had that struggling start up. ive been in plenty different cars, classes of cars, bmws, hyundais, benzs, toyotas, and no one struggles like hers to start up once in below the half mark. all my friends have had their car near bottom tank, and it may start up not as smooth, but my gfs car clearly struggles, almost like it wont start, im so used to it, i know its gonna start everytime no matter how long it takes, but to someone in her car for the first time your thinking the cars has a weak battery or starter or something.