i had one for a full 3 years before the juke, brilliant car but as you say mpg only around 40-45 mpg.
in these days of hybrids its its only drawback, if the ap was better i would have one again in a heartbeat even at 40mpg.
i was lucky stratstone were giving £500 off the ap which was around 750 on wpms at the time so a bargain.