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Metro, I did just that with my brothers 91 Civic hatch to do some testing on a practically deserted road near his house. Although the OP would not have that problem the loop return fuel system added heat to the tank as the return fuel was warmed by engine heat. On one trip I went 9 miles and when I got back the reading had increased instead of decreased!
Once I figured it out and learned to compensate I was getting close to 90 MPG doing 15 to 35 P&G with engine off glides. No lights or traffic made it easy.
regards
Mech
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