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I read the lean burn threshold is 6 inches of manifold vacuum. If that is true then the effective compression would be atmospheric minus 6 inches, so I would tend to think spark knock would not be an issue.
I have never heard any trace of spark knock on my VX. At 53k miles there should not be any wear issues or EGR deterioration. I do run a can of BG 44 k occasionally to try to keep things clean. The inside of the engine (seen through the oil filler cap) is immaculate.
Last tank was 55 MPG with average temps around 40 degrees.
regards
Mech
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