Miller won last year's Moto3 race at the Losail circuit, one of the six wins he picked up on his way to second in the Championship before making the switch this season to MotoGP.
The Australian got a feel for the track on board his Honda RC213V-RS by having laps on the track during night sessions recently.
"Going around here on the GP bike is awesome," Miller told Motorcycle News. "The track flows really well and I'm gelling here better than at Sepang.
"In Sepang we really struggled to get out of the slower corners but here it's really flowing and it's a high corner speed track that's really flowing and it seems to suit us.
"Sepang is more of a stop-start circuit where you have to make a 'V' into the corner but here it's about letting it flow and carrying the high corner speed so that's similar to Moto3."
The 20-year-old said that Honda and his crew chief Cristian Gabarrini had been easing him into the complexities of MotoGP but that he had begun to run the "whole system" at the final test.
"They've made it as clear as possible for me and of course it's hard to get your head around it all because in Moto3 you come in and say that we need to lift the front or drop the front.
"Now in MotoGP I'm coming in and saying that we need more engine braking in one corner, a bit less in another and that's better but it's another thing to come in and have to give so much feedback," he added.