On road trips where I usually fill up a few times (going through canada), I wait till my bank statements show the cost, I add em all up, add up all my miles, and add up all my gallons (3.8L-1gal). I have my own spreadsheet that I input all this into, it gives me price/gal for the trip, which is the figure I have to use for fuelly.
This suggestion would save me a step, and if propose going a step further in allowing a road trip type fuel up, where 5,000 miles is an acceptable value to put in for mileage, or 110 gallons, ect.
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