First some background. The engines on Buster are Volvo Penta 4.3 GXi fuel injected V-6's. The engines have GM Marine Electronic Fuel Injection (MEFI) version 4 controllers. The MEFI controller was designed for Marine use, but it appears to be a favorite of the high-performance car and truck people. As a result, there is a lot of information on the web about the controller and there are relatively inexpensive tools and software to mess with them. The connector and software package I am using is MEFIScan (http://www.mefiburn.com/mefiscan.asp) and was $195 per engine. It gives the ability to display almost anything the fuel injection system knows about. One of the most useful outputs of the system is fuel consumption. The computer provides a display in US Gallons per hour. If I combine this with speed readings from the GPS and a bit of math, I get some interesting results. It is a little imperfect as I can only read one engine at a time, so I have to assume that if both engines are running at the same speed that they should both be consuming the same amount of gas. Below is a summary of fuel consumption at a few different speeds. I read speed in Knots and have converted the fuel measurement to Imperial Gallons. Then for fun, I converted to l/100km so you can compare with your car.
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Speed NMPG l/100km
5.0 2.7 91
5.7 2.5 99
6.4 2.4 103
8.6 1.6 151
21 1.3 190
32 1.0 237
5.1 3.6 67.2 <-- running on one engine