Wife consistently got around 450 miles per fillup when she had the car. Mostly highway driving. She set the cruise on 68 and pretty much left it there.
I, on the other hand, normally drive 55~65, and get around 325 miles per fillup in highway driving. (I think I probably get up to speed quite a bit quicker than her, though.  )Unfortunately, most of my driving these days is in-town, which gets me around 225 most of the time.
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Steve
'95 Polo Green SVX L AWD, 188K - "Kermit" (Gone, but not forgotten)
'02 Outback LLBean, 56K
'02 Black Sapphire Volvo V40, 133K - "Shadowfax"
'06 Triumph Tiger, 19K
'99 Suzuki DR350SE, 8.5K - "Geezer Killer"
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