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Well to make it fair, it would kind of need to be a round-trip average, to cancel out any effects of trips biased towards downhill driving. The best I've managed in my HX was 48.5mpg for a 216 mile somewhat highly contrived trip this past spring. Basically I was upset about the fact I always seem to get 34-35mpg in the city and no more than 40 on the highway, which is a couple MPG less than the car is rated at.

So, I went out and just drove about 60mph on the freeway for about 80 miles, got off on this exit for a road in the middle of nowhere and drove 45mph about another ~28 miles further out of town, then turned around and headed back. So about 56 miles at 45mph, and 160 miles at 60mph. Topped off the car at the same pump that I did several hours earlier when I started the trip using the same top-off method and it took just under 4.5 gallons.

In the end, it really proved nothing since I've never gotten near that gas mileage before or since then, but it was kind of nice knowing that at least in a highly controlled experiment, it's capable of turning in numbers that were better than 10% over the EPA rated highway mileage. For a while I seriously considered having an aero undertray made even and trying for 50mpg, but the idea of spending hundreds of dollars to try and save maybe $10/year in gas just didn't make much sense when I really got to thinking about it.
 

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The Silver Streaker said:
AZCivic - How about trading in your Civic for an Insight? MPG is obviously important to you.
I've thought about it, but I don't think I drive enough miles per year to have it work out, in terms of total cost. It's good to see that technology from the Insight will make it's way in to other cars, like the Civic Hybrid now. It looks like eventually all cars will probably be hybrids.
 
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