The best way for comparison is have a liter test between shifting gears at 2k-2.5k (as per Aztina's opinion) and shifting gears lower than 2k, then we'll see if there are changes. Because based on what Aztina said, it's no longer economical if you shift gear lower than 2k rpm. Aztina, do you fix cars ba? Or you just have theories about engines? Because i have a some sort of a challenging question/s for you about my car in which no mechanics have ever solved it regarding gas consumption.