1. Despite the usual prescribed usage (farther = physical distance, further is more metaphorical), almost everyone has used the terms interchangeably for... well for as long as they have existed.
2. Even given the prescription the ad seems quite clever to me playing on that very distinction - you can physically drive farther but buying our car is metaphorically going further in getting the very best.This message has been edited. Last edited by: BobHale,
"No man but a blockhead ever wrote except for money." Samuel Johnson.