Hey all! Jack here, featuring my grandma hand-me-down special, the 1998 Ford Escort SE wagon with the stock 2.0 SPI and 4-spd F-4EAT auto transaxle. I have done a lot of basic work to get this car running again, as it sat for a sizable amount of time in disrepair in my great-grandma's garage before I got it. It had a bad misfire, PCV failure, many of the breather hoses were shot or otherwise had deteriorated, and the starter would get heat soaked in over 85 degree temps, making it hard to start on warm days. Original plugs WERE STILL IN THE CAR! I replaced them and the wires, but then they fouled, too, and the car flashed misfire codes. I fixed that later, as stated in this next paragraph: I repaired all of these issues over time with the car, and it's now running almost flawlessly. A/C just stopped working, but I'm sure it just needs a charge. In this mass tune-up, I used: Bosch platinum plugs; NKG plug wires; Motorcraft ignition coil; Motorcraft starter; Motorcraft hoses & PCV hose&valve; Motorcraft EGR hosing & valve; and I replaced the (decisively nasty) air filter with a new Motorcraft filter. I flushed the cooling system, changed the oil (now three times), and flushed the transaxle. Car also has newer belts on it, that were put on when the car sat. I am also planning on ordering an Ebay set of rebuilt heads with hardened valve seats to negate the valve seat #4 problem these SPI's have. I also ran injector cleaner through the system twice over a two month period. My question is, is it normal for a basic tune-up like this to net such a HUGE mpg change? For the short time it was driven before I did the ignition work, I was getting between 20-25 MPG on the highway, and around 19-20 in the city, based on rough calculations. I noticed that official MPG stats for the SOHC SPI-equipped 3rd gen Escort wagon were about 28 city, 38 highway. My much more robust testing in the last few months and thousands of miles driven since the first tune-up has given me an average of ~29.8 MPG city, and ~41.5 MPG highway! This calculation was also done with a Thule cargo basket mounted to the roof rack, without anything in it, and only me and my small cargo bay toolbox in the car. With my Sears roof box and Saris 3-bike tailgate mount with a single bike mounted, I started getting the OFFICIAL EPA average. The car is sitting on the stock 14" steel wheels with newer suspension components. Is it normal for these cars to go above the EPA MPG average? Were they underrated from the factory? Mine has 114k miles and is steadily going up, as it is driven 50 miles every day. Runs like a top and idles nice and quiet, very little of the typical CVH/SPI vibration is going on with this car.