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Evaluating performance differences between fuels in vehicles on the road suffers from two problems. Measurements can be made in pairs of vehicles driven in parallel. Each vehicle is subjected to identical conditions but the vehicles and drivers may not be perfectly matched. Alternatively, tests can be conducted consecutively in a single vehicle. Variation between different drivers and engine builds is eliminated, but weather and road conditions may differ between runs. To address these problems, Shell have constructed a “dual-fuel truck” in which the fuel injection system of a V6 diesel engine has been divided into two halves, supplied from two fuel tanks. The whole engine can operate from either fuel tank, switching between them in a matter of minutes. Alternatively, each half of the engine can be supplied with a different fuel. In this way, two fuels can be compared in a single vehicle - in the same engine build, with the same driver, under identical driving conditions.