I'd use the full: in order to save on ....
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New2grammar
I went back the room to turn off the lights and lock the door. (The 'to' serves no purpose. The meaning is very clear without 'to'. To me, it has nothing to do with sounding better.)
Before visiting a foreign country, plan your trip to minimize time lost on asking directions and (to) save on travel costs. (Before visiting a fo
New2grammarYoong Liat, I agree with your answers as they sound better. However, what's the reason behind other than sounding good to the ears?
The explanation is above your post. I amended on my first post. Should have posted again. Sorry.