I have a long, nearby hill that gives me a fairly accurate measure of how my Defender is performing. When everything is good, I know how many km/h the speed will drop from a fixed speed at the bottom.
All I have to do is take into account the air temperature; the humidity; the temperature of the engine, gearbox, transfer case and diff oils; the direction and velocity of the wind; whether I have a kayak or canoe on the rack and a couple of other variables and I can tell if there has been a drop off in performance.
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) turbo, p/steer, RFSV front axle/trutrack, HF, gullwing windows, double jerrys etc.


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