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We did the before test this afternoon. We have a nice stretch of a road not far away which is good for testing. It's a straight 14,5-km road with a 0,048% grade (according to local topographical map). It's a 2-lane road but with few traffic. We were never in a vehicle's wake, just some passing cars on the left lane.
First, we filled up to the top at a station and 2 bottles too. We went to the starting point, filled up again the tank to the top and stopped at a mark we could recognize. I throttled at 100% load and shifted at 2000 rpm to reach the cruise speed of 80 km/h on GPS. 300 m before turning to do the other direction, I shut down the engine and EOCed to the stop line to avoid any varying idling time due to passing cars. That distance was subtracted to calculate the consumption. Again, I throttled at 100% load and did the other direction in the same conditions. I shut down the engine again at the end and EOCed to the starting point, distance was subtracted too. The course was recorded with a GPS to know the exact speed. We fillup again to the mark, we put one full bottle (1,00 L) and 28,0 g of the second one. So that's 1033,9 mL (827 g/L at 25°C).
Conditions :
Road : 14,5 km in each direction - 0,048% uphill grade in first NW direction (7 meters on 14,56 km)
Temperature : 25,7°C
Pressure : 1021,1 hPa
Humidity : 43%
Wind speed : 13 km/h NNW (we faced it in the first direction, it's hard to have less wind here)
Sunny
Engine at operating temp
Tire pressure raised to 2,8 bar
Fuel consumed : 1033,9 mL
Distance without EOC : 28,56 km
Consumption : 3,620 l/100 km
Recorded average speed : 80,26 km/h
That is 64.99 mpg at 49.88 mph.
Next week, we will change the cogs and wait for a day with similar wind conditions and do another test.
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