Quote:
Originally Posted by oldtamiyaphile
The tread difference between a new tyre and a bald on is less than 1% unless it's a all terrain or something.
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Not true, and the smaller the tire, the more difference it makes. For example, my car takes a 175/65/14. New tire diameter is 23". My summer tires are 185/65/14 and 23.5" diameter new. If tread wears down 1/4", that has reduced the diameter 1/2" to 23". That's 2.2% and a full tire size down.
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Almost all my driving is done 1-5 miles at a time.
Best short trip: 2.4 l/100 km, 3.9 km