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If you take a production car to a race track you can measure engine life in hours (maybe 48hrs max). Low rpm operation is much more engine friendly. As Old Mech said, damaging detonation is a thing of the past, so IMO drive sensibly and don't worry about it. The ECU will protect you unless you're a complete tool, the fact that you even know what lugging is already puts you ahead.
My 1.6 petrol Renault will pull 5th gear at 20mph on level ground...towing a 1200lbs trailer. I wouldn't worry about what you're talking about, what RPM are you turning at 35?
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