Well the last set of tyres on my Octavia tdi, I've been running them at close to 40 psi on the front and back, , after the previous 2 front sets wore out on the edges rather than evenly, after 15 to 17000 miles. This set is still going strong after 21000 miles and I estimate have another 5000 in them max. I shall change them in a couple of months though. When I first started this higher pressure trial, I noticed a slightly harsher, noisier ride and slightly sharper steering I thought. As for fuel economy, I really don't know, too many variables.
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