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I don't have a tach...so I generally shift based on sound/speedometer, whilst keeping in mind the factory recommended lowest shift points (which, for mine, are 4th @ 33, 5th @ 48). I'll sometimes cruise downhill in 4th at 25mph (when I can do so with only minimal load), or go 20mph in 3rd (in the same conditions).
35mph in 5th *feels* like lugging to me. But then, I'm not sure what the actual definition of "lugging" is, exactly. Is it lugging the engine to drive up a hill in so high of a gear at such a low speed that the engine can't maintain speed (such as uphill at 25 mph in 3rd)? Or is that something else? Is it lugging if the engine speed drops below idle at that speed in that gear? Or is it only lugging when the vehicle lurches with each cylinder firing?
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