2011-09-09	371.1	11.841	$3.749	31.34	"Driving the car from AZ where I purchased it back home to NM. All highway miles at ~72 mph avg. The seller filled the tank with regular 87 octane gas (very nice of him), but the engine is designed for 91 octane. Before getting on the road, I topped off with 91 (to make sure the next measurement was with a similar fill), but it took less than half a gallon. I refilled with 91 this time, but this tank measures the mpg with the 87 (plus less than half gallon of 91)."
2011-09-09	234.6	6.729	$3.759	34.86	"This tank fill was upon arriving home. It still measures driving the vehicle home from AZ (where purchased) at around 72 mph avg. All highway mileage, but with higher octane (previous fill was with 11.8 gallons, but it has a 16.2 gal tank so ~4.5 gallons were still 87 octane)."
2011-10-13	626.4	14.804	$3.529	42.31	"First full tank using hypermiling techniques, and 90+ octane. This is mostly commute mileage."
2011-12-01	628.6	15.057	$3.189	41.75	"Weather a bit colder, but not too bad for this time of year. Still using 91 octane."
2011-12-18	513.5	12.973	$3.059	39.58	"Colder temps and snowy weather. Had about 20 miles of stop-n-go traffic jam because of the weather. Filled up early because gas was cheap."
2012-02-15	606.2	14.645	$3.399	41.39	"Despite cold snowy weather and winter gas, I ended up doing pretty well this time. Presumably because I'm becoming more accustomed to the car. Unless otherwise noted, I'm using 91 octane exclusively."
2012-03-22	646.5	15.232	$3.869	42.44	"Weather started warming up."
2012-05-07	623.4	13.968	$3.889	44.63	"Almost summer-like weather for most of the tank. It was still winter gas in that tank since it was previously filled in March."
2012-07-04	672.4	14.822	$3.509	45.36	"Summer time goodness! Despite the 38 cent price drop from the previous tank, I'm still using 91 octane gas (the highest octane you can get around here)."
2012-09-02	483	10.303	$3.769	46.88	"Another summer time goodness tank. This will be my last tank as a full hypermiler. This ""hobby"" has become obsessive for me, and it's making me into a weirdo...avoiding taking the HHR when it might take me into stop-n-go traffic situations, going far out of my way if it means avoiding traffic, and such. I will still drive efficiently, but no more EOC, no more avoiding traffic. I'm going back to being a normal person. I suspect my mpg will still be above 35, which is still very respectable for such a roomy, practical vehicle."