I just got my best tank ever, and I had the car loaded with about 500lbs of stuff on the return trip (tank was for both ways). Granted, everything when really well as far as driving conditions. But I also had the CEL on the whole trip (O2 and knock).
I have found it almost pointless to P&G at 60 with my car. It has to be one heck of a hill, and then to get it back into gear, and get the torque converter to lock seems like it balances out most of the benefit. But with a heavy load it drives like a aerodynamic Legacy!
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