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Originally Posted by givemeslack
Even without a mpg gauge, you can still use my method of only filling up halfway AND get an accurate reading.
From then on, whenever the tank is empty, only fill it up half way, keeping a log of the gallons of gas put in, (or just save all the receipts).
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You could fill up with a fixed volume of gas, and drive it until the reserve light comes / stays on, then reset the odometer / trip meter reading and fill up with you fixed volume of X gal / L gas ASAP after.
That way, you'll even have a decent idea about the actual fuel consumption judging by the distance driven, rather than by volume.
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Pulling in to a gas station that is on your route, shutting off the engine, and filling up with however many gallons you want does not waste gas.
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For some members, it'd double the number of stops on that trip
Every time you stop - voluntarily or forced by traffic - you're using more gas than you would ideally have needed.