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If I'm not mistaken, that's caused by the hardware acceleration setting. If you disable it, the UI will run more sluggish, while with it...
If I remember correctly, each BeamNG car is assigned to one core of the CPU, so in your case, having 4 cars on a quad-core CPU is being...
Don't think a single-cylinder engine sound would fit the best onto a 3-cylinder o_O
Decided to re-run the benchmark to see if anything changed from last time... Gained only 4 Mbeams/s :p
If that's true, then that's REALLY fast o_O
This is the most-up-to-date tutorial for map creation