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If you break it in easy, such as keeping the rpm's always low, sustained highway cruising at low rpms and generally babying it when driving, the rings will never fully seat like they should. This will cause the engine to have less effective compression. Then, you will tend to burn more oil over time because you didn't develop the proper cross-hatching and piston ring to cylinder bore seal that you could have with a proper break in procedure.
People think that you will harm the engine with a hard break in. Not so. It's actually better for the engine if you do it that way. Furthermore, since we all have rev limiters where the ECU cuts off the fuel supply after a certain rpm level is achieved, there is really no way to seriously harm these engines by accidentally over reving them. The built in nannies will always protect you from that.
Now, I'm not saying you have to drive it like a maniac to get a proper break in procedure, but don't be driving it around like a hypermiler bent on getting maximum mpg. These engines like to rev and you shouldn't be afraid of taking them up there to higher rpms.
If you want an oil burner, just drive it nice and easy and be afraid of high rpms.
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