Percentage of milage? Percentage of actual time? Percentage of days of week? Does deep snow count as offroad? I currently have 23K and have two more months until I reach one year of ownership. So, lets say 27K/year. 2,700 miles offroad in a year is a bunch. In mountain bike season I go offroad 5X/week or so but for short (1/2 mile or less) distances. We have lots of snow here and it gets deep so that counts for a little.
Compared to overall milage less than 5% of the time I am offroad.
Compared to actual hours and minutes same. Less than 5%.
Days of week offroad however is 5/7 or 71% of the partial days I am offroad.
Including snow my time in 4WD goes up to probably 5-10% of total miles.