I am now at 11,000 miles and just last week I did an oil change and switched to Penzoil Platinum 5-20 and a Purolator Premium Plus filter. Then over the weekend I filled my gas tank, but parts of the gas consumption was from the previous oil. Typically I get 30-31 MPG and lately I've been averaging 28 due to short commute to work. So over the weekend i had to fill. Doing so I ended up driving 189 miles. I'd say about 60% FWY and 40% city. I use the half-tank mark to tell me if my MPG is going to be disappointing or not. Normally if it's anything over 150 miles at half, I'm pretty happy since I can expect to get at least 29 MPG and I've never exceeded 155 miles at half mark with my normal driving. So with this fresh tank I managed to hit 179 miles at the half mark!!!! I am pretty darn sure once I'm done with this, I will exceed 34 MPG. I can't wait to see the result, but I'm also not in much of a hurry to burn gas to find out. I also noticed that I didn't top off this time during my fill. I wonder if the added fuel pressure from topping off is throwing off the sensor. But with the change in oil, being synthetic, I can feel the acceleration to be so much smoother and effortless.

I will follow up with the results once I finish my tank.