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I upgraded to Toyo Proxes low roll resistance tires 3 years ago. Added a good tire pressure monitoring system. The tires are inflated to 45 PSI and for tires only rated to 45,000 miles wear I have not seen any abnormal wear. From a fuel consumption stand point I do a variety of things and have dropped my utilization from 11.4 gallons / week to 8.3 gallons. I have a 18 gallon tank. So I really only replace 12-13 gallons every 11-12 days. I keep all of my receipts so I can better track my utilization. My ride is a 1997 VW Passat VR6 rated at 19 mpg city. I avg 25-27 mpg in city driving.
Lots of tips here on Ecomodders and they work without going to extremes.
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