Hi MJ, I had a 1943 H which I used to drive a distance of 75 miles twice, sometimes three times a year, often towing a trailer with a Little Genius 2-furrow plough behind it. Actual travelling time was 5 hours making the average speed 15 mph, and used 5 gallons of petrol i.e. 1 gallon an hour. Petrol was Unleaded 91.
Here in New Zealand kerosene is a lot more expensive than petrol and is not even considered as a fuel.
However, I have a son who is an maintenance engineer at the local airport and several years ago one of their jet fuel storage tanks became contaminated with water and the fuel had to be dumped, so I became the beneficiary of about 600 litres of jet fuel. Petrol is not a cheap commodity here so thought it would be good opportunity to save some money by using the jet fuel in the tractor. The heat control valve in the manifold was already in the mid position (seized as they always are) and also the radiator shutters were installed. The engine ran well once it was fully warmed up. Power was slightly down and fuel consumption slightly up but overall performance seemed to be pretty much the same.
I haven't been able to find out what the octane rating of jet fuel is but with the H having a compression ratio of 4.5 to 1 I didn't think it would be too critical and the engine didn't seem to suffer any adverse effects.
I calibrated the tank on the H so that I could more accurately determine the amount fuel that was in it. 6" depth = 10 gallons, 4" = 6½ gallons, so you used 3½ gals. on your outing, a good day out. (We use the metric system here but I still work in gallons [ Imp.] and miles.
On the side, my 1951 Super C is not as efficient as the H, it only does 12 mph and has a fuel consumption of 1 gal. an hour. Sid.
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