I bought my beautiful, funky 2007 prius new with 31 miles on it and I loved it and it loved me through many years. My husband decided that I needed something less sketchy for a solo 3400 mile road trip with our kids in May so we retired the old girl and picked up a new to us 2018 with 110k miles. It was getting 45/46mpg but I figured it needed a little love and care and routine maintenance and it would pop up to 52/53ish because that’s what I read was pretty reasonable to expect with normal use. First we replaced the tires with Michelin x-tours, got it aligned, changed the oil, and replaced the 12v. Still getting 45/46 after breaking everything in on the long road trip. Replaced spark plugs, and the engine/cabin/HV air filters, and pcv valve just for good measure. Still getting 45/46. We’re changing the brake pads and getting a better look at the rotors this weekend but my heart isn’t in it and I feel like this Prius is cursed, maybe by my old girl because I abandoned her. I was still getting 43-46mpg with the 07, depending on how close I was to needing an oil change or if it was really hot/cold. I drive this new one the same way I did my old one, not like a maniac but also not so slow as to get myself run off the road by every lifted truck in town (there are tons). I’m pretty light on the air conditioning use. I almost never carry more than 400lbs worth of humans around and there are no bricks in my hatch. If anyone has some insight that could account for why this car is getting such lousy mileage, I’d love to hear it because I always thought I’d be a Prius driver for life and I have no idea what I’ll buy if I sell this car.