Yes, yes I have. Changed my driving habits to -almost- what hypermilers would do.It pays off.My last tank fetched me 488 miles from 11.3 US gallons :343 mpg rules And that's in urban freeway traffic, which has a tendency to stop and go. Hint: Don't stop. Stopping kills your economy. Ideal weather helped too, it was 23C and sunny all that week. It got cold and rained a bit so my current tank won't be as good.