Byproduct from extracting citrus juice from whole fruit is made into a slurry and extracted to provide a rudimentary peel juice. The engine braking may be enabled when said overspeed operation is maintained beyond its detection in combination with continued throttle actuation. At a second location, the oil flow is subjected to light at a wavelength which will cause oil to naturally fluoresce. Evaluation information may then be obtained based on a variance of the value of the performance parameter of the plurality of locations.