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like I said, 0W30 is for better cold starts, I do not need to worry about that anymore. the only time you see a boost in efficiency is when the engine is cold, and I mean really cold, my 5W30 stopped being effective around -10 to -20 Fahrenheit, that's where 0W30 would have been necessary. I can actually tell when my car has trouble with an oil, because of other mods I have done to it. it starts to shake at idle when it doesn't like the oil situation (like 5W30 at -20F, or older oil). it hardly ever gets below zero, here, so I do not foresee needing 0W30.
if your car is known for uneven tire wear, then by all means run the tires at a higher pressure, but most car manufacturers go to great lengths to come up with a tire pressure that is ideal for wear and efficiency, especially on cars like my saturn, where it is obvious they care about efficiency. my question is why didn't volvo release a change to the recommended tire pressure for that vehicle?
yes, nitrogen is stable enough to make a difference. I drove my saturn (with a proper nitrogen fill in all 4 tires, from the factory), from -40F weather down to tennessee (I think it was 30F), and didn't see a difference in tire pressure, no need to stop and bleed off built up pressure, or on the way up pump up my tires, just drive. nitrogen also stays filled longer, leading to less need to check the pressures (mine went about a year at a time without needing more). it does this because it has physically larger molecules. it will also help protect TMS equipment and alloy rims commonly found on modern cars because of the lack of contaminates.
and yes, tires are used on a wide variety of vehicles weight wise. maybe not to the extreme I said, it was an example, but they are.
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