1. If you have not read the many posts on taller tires and the ABA tested results, comments about % really carry little or no factual basis. They are just your opinion.
5% is the threshold. Under that and you are at the manufacturer's margin of error. Over that and you will see gains that are verifiable.
2. No one on this forum would do what the mag did. Wrong forum. So long drawn out discussions on the numbers from the mag are pointless. Except for the EXCESSIVE weight on the 19in rims/tires. Adding weight is pointless in an mpg environment.
3. While I agree that exceeding eom specs can be unhealthy for wear and tear. (See my multiple comments on lowering kits on this forum, a 5% increase in tire diameter is NOT destructive. With 270k miles on my infiniti Q45, I can say that a taller tire was not a problem.
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