We've seen a nice increase in our baseline MPG this week (I say baseline because the AC knocks it down) and I think it should be attributed to finally hitting the 3000-mile mark. (well, 2950...) A drive that usually gets me 45 MPG got me 49.7 last week, and if I had more driving to do I'm sure I could have hit 50 or more. Then the heat here got bad and I hit the AC. We're still getting almost 49 MPG, up from our usual 46. Amazing. I love this car more every day, even after 4 months!
I got a boost in MPG after about 1K. I thought it was break-in, but in retrospect, my driving habits when I first got the car were not ideal. 1. I drove it on the highway a bit more often. Driveing on US19 is much more ideal for MPG with this car. Was for my Saturn as well. 2. I was showing off the car, playing with the car's features, including NAV, and AC was on during those times. When I started doing just my commute on US19, my mileage shot up. Also the weather started cooling down, so I was using less or no AC.
I'm seeing a slow but steady. My first tanks were 45, 46, 47 48 mpg. Then I had a few 50 mpg tanks. My current tank is at 53 mpg. This is a combination of city and highway driving. I will say this current tank involved a 30 mile drive to my sister's house and back again. It was Sunday afternoon and not much traffic so I did 55 mph up and back. This significantly increased my mileage over what it would normally be. Even though highway driving is supposed to be less mpg than city. I don't seem to be seeing a sudden, dramatic increase. Just a slow and steady increase. I'm hoping the trend will continue as I increase mileage on the odometer, get that oil change in October, check/adjust tire pressure.