I was just wondering if the following is true: Lower pressure tires = faster wearing? I ask this because my Specialized Sport 2.2s have hardly worn away at all over 7 or so months, but now in this last month, I found the rear one really wore away (still has 40% tread in it, but last time I looked at it and checked it's tread (a month or so ago it looked like it still had 70% or so left...). I have been running a fairly low pressure in this last month and riding 2 hours of urban every weekend (i.e., I rode my low pressure tires on asphalt) and about 5 hours of trails every weekend. I've noticed the tires stick a lot better and it makes for funner rides because I can ride faster without worrying about slipping.
Any comments? I'm trying to use up the least amount of money possible, as I don't get too much pocket money, so I'd prefer to run higher pressure and sacrifice the benefits of low pressure rather than run low pressure and have to buy a new pair of tires for 60 euros.