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Originally Posted by ppgroup
The dealer that did it insists that most tires with air leak about 1psi per month, where I should be good here for 3-4 months or more.
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This sounds like a snake-oil salesman to me. I check my tires once every three months, and never need to adjust them (except to adjust for summer vs. winter temperature changes which does affect psi). Pressure affects how the tire contacts the road - which is the only thing that matters. The gas used to create the pressure is not relevant (for normal, passenger cars). But, do whatever you like - it's your car. However I'll bet this is a trend that vendors will exploit until the public becomes educated enough to realize it's a sham.