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I always put 5 gal., and my fuel light goes on after 100 miles. Not "exactly" sure how many miles i could get out of my reserve. Assuming I get another 20 miles. I get close to 24-25 miles/gal, in the city.
Avg. speed of 82mph, for 3 hours (filled up before, filled up after I got there) and it came up to 29.4mpg... and I was pushing it some parts to pass cars and such...