I'm eating about 20g carbs a day.
I generally run a few hours after lunch and have a glass of water before I go and when I get back, as well as staying hydrated throughout the day.
Some people like exercising while fasted but I don't feel well when I do that. If I felt the need for fuel before starting I'd probably do a shot of heavy cream or half a protein shake.
My energy seems to be increasing the more I run!!