Quote:
Originally Posted by Herbicidal
Yesterday I did my second fill up since I bought mine and this tank averaged 35 mpg with a mix of city and freeway with the AC on most of the time due to the hot weather here and horrible smoke in the air from all the fires.
Needless to say, I'm VERY HAPPY with the gas mileage. 
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And as you add more and more miles, up to around 20,000 or there abouts, the MPG will continue to improve. My 2007 hatchback auto-tranny has 36,000 miles and I get around 36 city with A/C on, and 44.5 highway w/AC on.
I run with the tires at 50 PSI since around 8,000 miles, and the tires look to be good through 45,000 or better. The ride is stiff but I got use to it, no worries. I run Mobil1 0W-20 fall, winter and spring, and 0W-30 for summer to eek out about 1% to 2% more MPG, but I run synthetic for other reasons too.
I've been adding Lucas UCL (Upper Cylinder Lubricant) to the gas every fill up, and this has shown to add 7% - 8% higher MPG over time. But the biggest MPG improvement was from the purchase of my ScanGaugeII. It has gone far in training me to drive in a more fuel efficient way, as it provides realtime feedback as I drive.