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Hello, I've had a 528i auto touring, and it was sensible to tire pressures. I always use pressure above 2.3. The touring being heavier (factory spec) states 2.7 in the rear axle when loaded. I used 2.4 in the winter/rainy weather and higher when sunny. I got 12lt/100km on LPG (highway driving auto gearbox cruising 90km/h). Added benefit of higher tire pressures is better manouvering when stationary or slower speeds. If you're in Germany, I would try some grill block when cold.
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