I took my 2014 Prius Two (45,000 miles) to the dealer 03/02/2019 for a recall (18V-684 JOV) software fix that was supposed to remedy a problem associated with sudden loss of power at high speed that might cause an accident. It took them 1.5 hours to complete. I was getting 40 to 45 mpg's around town before the fix. After the fix my mpg's dropped to 30 to 35 mpg's. My driving habits are conservative and I use cruise control when I can. I thought maybe the traction battery pack was failing. I ordered a Carista OBD/Bluetooth device and used the FREE DrPrius app to check the battery status. No codes or engine check light. Batteries are fine except for 1 pair that has a low resistance reading. (I replaced the 12 volt accessory battery in the trunk a year ago and there was no change in mpg's.) After I ran through the Carista app diagnostic check, the mpg's improved to above 40 mpg. Really weird. Wondering if Toyota did something on purpose to make owners trade in their cars. If they did, how can you prove that they did it? I got 44 mpg on a 2 hour interstate 70 mph trip. When it was new, I was getting 50 to 54 mpg's. Of course, the Prius mpg computer's mpg reading is bogus. Actual mpg's are 5 to 7 points lower. Anyone else notice the same difference after the recall service?