It's the tires. Yes, the Volvos weigh 800-1,000 lbs more than the Subi, but they all have the same Haldex AWD system. The Volvos have wider tires which doesn't help.
"M" is just for going forward from a stop, very icey conditions, so it isn't starting out in 1st gear. I have never needed to use "M", nor do I intend to.
Volvo also limits 'slip' by using the ABS on the spinning wheel and limiting rpms. I have never tried backing up my sloping driveway with the AWD Volvo. Forward always worked great, there is no traffic at the base of my driveway.
I wonder if the Subi has a lower rear gear ratio?
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Keeping it running is better than buying new
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