[3] "Well, 500 yen is fine."
When asked for a pick-up from a girl by car, like a taxi driver, it is a pattern to charge for the price. By requesting a small amount of money, there is a possibility that it seems to be "a stingy man" to a girl. I would like to accept requests from girls with generous heart.
【4】 "Because gasoline is a waste, let's go home soon."
It is a pattern to try to turn back on the grounds of gasoline consumption. It may be convinced if it returns from the time constraint of "It will be late soon ...". However, if gasoline is considered to be the reason, giving the impression that gasoline fee is being charged around the clock, there is fear that girls may be regarded as "stingy guys".
