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Originally Posted by pcs0snq
I do not understand why Performance "handling" as in cornering or braking has any bearing on this at least from what I think Shawn is doing. ie 99% Eco. driven. My feeling is the performance from 30 to 60psi on these tires would ONLY show up at a track on a course with a stop watch pressing the car to it's limits. That is meaningless in a thread about Eco.
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It is not meaningless, when your car is more capable it means if you encounter an emergency situation the difference between running 60psi and 30psi could be your life or somebody elses.
Yes for eco reasons it would probably be better if we all ran the thinnest wheels availaible and drove 20mph everywhere with as slow acceleration as possible. This would be great for MPG on a closed course.
But in the real world where people and pedestrians are all around us we need to consider safety factors and be responcible. This has been my arguement the whole time.
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That said, Eco to me is total cost and I think it's wise to keep an eye on the overall cost when making changes to improve mpg performance. That is changing the tire pressure from 45 to 60 may save 1% on fuel use but may also cost you 3% more for tire use. Net savings -2%. Put that in $ of the life of the trie to get a fell for it. The cost to replace them is around $500. Figure avg use is 35k that's about $6 per tank of fuel.
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This is spoken like a wise man! I think the real question for this thread is where the tolerances are. What are the boundries of safety, tire wear and comfort?
Seems to me that something I overlooked was sidewall size which probably plays a larger factor in tire pressures that I had originally considered.