This is my first post to this community, so I hope I'm in the right place! I just wanted to ask a question that has been on my mind for a few months now. My sibling and I both own 2013 Ford Fusion Hybrid SE's (the exact same models -- his has ~6,000 less miles than mine does, 43k vs 49k) but I have noticed a significant difference in the fuel economy/mileage between these two vehicles. Mine has about 49k miles and has averaged 43.5MPG over its lifetime, with recent nice weather (I'm in Minnesota) I can see 50+MPG on my commutes in a metro area. Occasionally I will drive my sibling's Hybrid but notice a stark contrast in the difference in mileage. From the start you can tell that his is a lot more willing to quickly turn to using the engine than mine is - driving the first block leaving our house, mine will always use battery but his always gasoline. We buy the exact same gas from the same station, but I notice a ~10MPG difference on trips to and from the exact same location with his vehicle. Keep in mind, I've noticed this as the driver of both cars, so I have the exact same tendencies in each test. If anything, in his Hybrid, I tend to drive even slower and coast as much as possible to get a better fuel economy.
Nonetheless, despite removing every single variable in a drive except for the vehicle, I notice his consistently does worse on the road. No AC, windows up, etc.. Are there any reasons you here at FFHF can think of off the bat that would be a viable reason for this? I'm happy to answer any questions but I just can't figure it out for the life of me.