Excellent data. Thanks for sharing it.
I think the EPA numbers are really unreliable for this car. My all time worst tank was 26mpg and I was flogging the car down highway 1 along the northern coast of California. Most tanks fall in between 29-31mpg. 90% of my driving is short city and highway trips of no more than 5-10 miles at a time. I tend to avoid rush hour and it usually takes me about 2-3 weeks to cover the 340-360 miles when my low fuel light comes on. My all time best was 35mpg on a highway only tank. I only buy 87 octane.
The EPA numbers are horribly unreliable for any manual transmission vehicle. Either whoever is doing the testing has NO idea how to drive a stick, or someone there is being paid off by the automatic transmission manufacturers.