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I have driven my 1998 Legacy Outback from Denver to Toronto. While in Toronto I have been going on fishing trips a few times a week. Almost all of this driving is on interstate/freeway/highway roads. I have been keeping track of my mileage and mpg every time I fill up. I do this as much to see how much gasoline is actually costing me in US dollars. I have been getting anywhere from 26-28 mpg using Costco’s lowest octane gasoline. I try to use Costco gas as much as possible. The only time I noted a significant drop in the miles per gallon was when I had to buy non-Costco gas in Nebraska. It must be something with the corn ethanol percentage in the gasoline as I noted this same thing happening when I drove my ’97 Grand Caravan to Toronto last year. I should note that my Subaru has a 5 speed manual transmission and there is nothing installed on the roof rack. I do have the back filled with fishing equipment.
 

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2006 3.0R JDM with shift paddles and SI drive
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06 3.0R 26mph 0n highway 20 mph or less in town

because it is turning over at 2000rpm at 60mph with extra torque etc.

So if on highway mainly 3.0R is better.

The down side ie they eat the fuel in short running.
 
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