Remember you will always see a decrease in economy fitting larger tyres. Your car is calibrated for 265's so throwing a 305 on it means that the wheel tyre combo is doing less revolutions to cover the same distance. This will read less on your trip/odo meter as its all calculated for the smaller diameter factory fitted rubber.Originally Posted by threedogs
For example a mate and I did a 150km trip, he was on 35's, I was on 33's, we pulled up at a servo nearing our destination and my trip meter said I had travelled 20km extra then he did. (both trip meters set to 0 at start of trip). We had identical running gear, engines, gearboxes and diff ratios.
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