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'98 Jetta with 180,000 miles. Running last two and half years on B100/B99 (summer) and B20 (winter). That's about 35,000 miles on one or the other. Results: - Slightly reduced (?) mileage, from 48-50 to 46-48 (manual). - Greatly reduced soot in engine oil and exhaust. - No perceptible running...