Filled up a couple times on a road trip last week to test. I got about 18-9MPG on a highway trip. Spent some miles in town showing off the car (and the V8). THAT netted me about 11-12. The return trip was a bit worse than the trip up, but I averaged a WAY higher speed.

2004 4.8is with (now) 14,200 miles.

My 2004 3.0 on the same stretch got much less on the highway if I drove aggressively. But I could still net about 15-16 in the city. A little give and take it seems.

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