Student or Learner
Which sentence is correct?
I plan on going to X earlier than usual.
I plan on going to X earlier than usually.
I think here 'earlier than usual' could mean 'earlier than it is usual'. For instance, it is usual to go to X at 7 o'clock (almost everybody does that way), than you are planning to be different from the majority of other X goers.
And 'earlier than usually' could mean 'earlier than I usually do'. For instance, you usually go to X at 7 o'clock, but this time you want to do it differently.
Not a native speaker