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- CX5 Akera 2.2 Diesel
I have seen the same thing as well. Really weird because I still always push around 27 and up with my usual commute and typical daily driving. I'm around 25 now. Not sure what's up. My tire pressure is around 35 which is normal, but I usually do run around 38. Been meaning to fill them up but I don't think they'll make that much of a difference but we'll see.
Tyre pressures do make a significant difference, in fact the easiest way to get a 10% improvement in fuel economy is to increase pressures by as little as 4 to 6 psi.
I run mine routinely on 38 front 40 rears. On longer trips or towing my boat, they go up another 2psi at least.
It's all about rolling resistance. Higher pressure = less rolling resistance.