Lugging and Shift points

[MK7german]

I have a 2016 Stage 2 E30 Fiesta ST, and I'm worried about whether or not I’m 'lugging' the engine. While the car is cold, I usually shift at 2,000 RPM and cruise around 1,250–1,500 RPM (typically 6th gear at 40 mph). I only use about 30–45% throttle to speed up, and I never accelerate heavily in 5th or 6th gear until I'm above 2,500 RPM. Additionally, I never accelerate if the engine feels like it’s shaking or struggling. Is this fine for the car, or should I change my habits?

 

[killer5280]

Don't lug it. Let it rev freely.
But don't run it hard until the oil gets up to temperature.

 

[Capri to ST]

I would take the revs higher in each gear and cruise at a higher RPM, I do think you're lugging it or at least coming close. I would not feel comfortable shifting my car at those shift points or cruising at that RPM.
Just for comparison, cruising at 40 mph I am in fourth gear, not 6th.

 

[atlantaM3]

I never go below 2k, that is the low point to shift to a different gear. if any load at all if needed, sift to a gear where I am over 2.5k min. These are still small 4 cylinders after all, with main bearing etc sized for small 4 bangers.

 

[madhatter]

LSPI is a common thing with ecoboost motors. Don't spend time below 2k. If the motor is cold, keep it below 3700 until there is a dot or two on the temp gauge, but don't go below 2k if you can help it.