Using two methods to calculate, we averaged 9.5 MPG on our last trip to Florida, from Long Island, with no toad. It was about a half-gallon lower a year ago when we pulled the toad.
The two methods were 1-Scan Gauge II and 2-a manual calculation of mileage based on fuel consumption at each fill up. Manual calculation was slightly lower. Consistency is tough to maintain when filling up. I stopped when the pump "clicked" off at the handle the first time, at each fill up and used that amount of fuel for the calculation.
2004 motorhome on a 2003 Ford V-10 chassis. Kept the highway speed at just about 57 MPH on the highway per the Scan Gauge II.
I just have to pause and offer my thanks to my good buddy Jim for setting this thing up on COLUMBUS day! Jim knows how much COLUMBUS means to me, especially with all the URBAN RENEWAL going on there and to know that my buddy Jim has remembered me in this way is, well, it is just awesome! Thank you Jimbo, you are a true friend!
https://lh3.googleusercontent.com/vv5pPJQvfdlGAWwYYrKWDzSmMzCOwYxFbI-GOcuBC6E=w214-h207-p-no height=400 width=500
O-H !!! :b Urban Renewal has turned into blight.