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What people seem to have neglected to mention what higher tire pressures would surely increase the chance of a blowout if struck, like a kerb. In my view, just as you would have to keep a more critical eye on pressures with a low indexed tire (sidewall height), you equally have to take into account the vehicles extra load. I personally like 50 psi as i use 135/80/13s and do not carry additional weight. I haven’t done the A-B-A test, but would be surprised if this yields > 1% efficiency
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