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Originally Posted by Mister Byrnzoil
I'm a relative newbie here, and I'm still learning things every day, so 'All due respect'... but what are you doing in that RPM range in 3rd and especially 4th gear... I think you are 'lugging' yer engine, simple as that.
All of my readings here lead me to believe that you should never be below 2k rpm in the upper gears. Since I put on oversize tires, I try to keep it above 2200 rpm.
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I don't consider drifting (holding speed w/minimal throttle, not the sideways kind) on level ground at 40 mph in 4th gear to be 'lugging' the engine. Under minimal load, a vehicle equipped with an automatic will shift into 4th gear by that speed, why should the manual be any different? Additionally, you must apply a significant amount of throttle in order to downshift the auto from 4th to 3rd (at least on my 300D you do). No vibration is experienced during that period.