Just filled up yesterday, and got the best tank ever. 48.6 MPG, couldnt believe it. I think the Halos are working...though the weather was hot, and the roads were drier. I have been doing more of the EOC, found this killer stretch on a dirt road for several miles. I have been keeping the speed below 55 and trying to cruise around 48-53 on 50MPH speed limit roads. These roads have a lot more stops than the interstate though, but I think the MPG improvement is worth it if you have the patience. It really is all about figuring out your route for maximum EOC.