Range varies with conditions. Dial down the fun, range gets better.
My FX 5.7 is set up as SuperMoto. I have gone 90 miles VERY slowly.
My commute to and from work is 20 Miles. 7 miles street 13 miles freeway.
Gentle riding gets me to work with about 60% left. City streets to work
gets me there with about 75~80 % left. 75~80 on freeway gets me there
with about 50% left. I would think that dirt riding will decrease range
compared to similar street speeds, but, probably won't be going 75 mph
all the time off road. I would imagine that 30 miles should be pretty
easy to reach. If you ride with only ONE battery, It will be 20% lighter,
same torque, but, less HP. Zero to Sixty times only .3 seconds slower
with one battery, so, unless in competition, shouldn't be too much
difference in regular riding, maybe even quicker corner to corner
because of less weight. Swap batteries in a couple minutes.
Riding in Eco mode for "normal" riding would help increase range,
then, switch to sport for FUN.