I have a quick question. I have recently set my duty cycle at 70% the engine is smooth as silk and idle is excellent. However, this is a bit lean. Am I doing any damage to the car, I live in colorado at 6000 feet and they do use ethanol in the gas too(10%). Any advice apreciated.

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Martin Ingram
Colorado Springs
2005 320 CDI
2006.5 VW Jetta TDI
1991 560SEL (179000 Sold)
1972 280SEL 4.5 ('The Lead Sled' 320000 miles when sold.)
1972 220D (225000 when sold)