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I only ask because a truck tire can be 15/32 tread depth. So wearing down to 4/32 can be a 22/32 inch difference in overall height/diameter. There are fewer revolutions per mile with the new tires than the old. So there can be a real difference in fuel economy with new tires (even same brand, just new).....like an effective gearing change.
If you're calculating fuel economy by resetting your GPS tracking, that's accurate. Using your odometer? Not accurate.
YMMV
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-Eric
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