As a test, I filled up this past weekend at my local freeway interchange, and again at our usual lunch / pit stop about 80 miles north. Calculation was 30.3 mpg, so per my Apr 3 report, new tires appear to have had only modest impact on mileage -- or perhaps none at all. Details: '06 9-3 Aero, auto trans, w / 25K miles, driving 75 mph - 85 mph northbound from Central Illinois, primarily using cruise control; ambient temps in 50s; intermittent rain; HVAC on "auto."
On the subsequent fill, which included freeway, suburban and slow local driving, I calculated 23.5 mpg. Both fills were with premium fuel, in this case from Marathon and Phillips 66. I typically fill with Shell, Mobil, or Marathon premium.
For those observing poor mpg results, I suggest a test drive under optimal conditions to determine potential best mpg. If that result is substandard, then there may indded be a problem.
posted by 72.34...
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