If I had a ScanGauge I could tell for sure, when I first started doing this I was driving 45. I gradually started slowing down and my mileage has been steadily increasing. The temperature is also increasing, but it is passing the point where it is offering any mileage gains since its tough to drive without the A/C.
90% of my driving is to and from work, where I go 30-35 and I'm getting very good at timing the lights the entire way. Freeway driving only hurts my mileage.
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