[GreenHornet]

After doing some research I finally found the Yanmar 2TNV70 performance curves. They are pretty comparable to the Kubota engines specs which is what I suspected. Like the Kubota engines these can also be ran up to 3,800 rpm although torque falls off substantially. The Yanmar engine has a pretty flat BSFC curve from 1400 rpm all the way to 2600 rpm. At 1600 rpm which would be your overdrive gear(s) You would be running the engine at roughly 45% load. At this output level you are only using .19 gal/hr of diesel fuel. So in other words this engine is very frugal at using diesel fuel.

Many diesel generators from what I have been told and have observed can utilize roughly a gallon of fuel for every 4 hours of continuous use at 2400rpm or close to 65% load. So this falls in line favorably to what the curves and math are telling me with the Yanmar. If I setup the gear ratios properly and in my overdrive gear I have it pegged at around 1,600 rpm, in ideal conditions I should be able to cruise almost 6 hours on 1 gallon of gas. Which would give me a theoretical range of 345 mi on a single gallon of diesel fuel at a speed of 60mph.

Now of course coefficient of drag and weight will play a big factor into this theoretical single gallon range which is why it is vital to keep weight to an absolute minimum and aerodynamics as slippery as functionally possible.

I really want to push the envelope on this prototype I have seen what is possible with these tiny diesels in conversions and even in small city cars such as Aixam. Now I want to see what is possible in a highly efficient aerodynamic purpose built vehicle. This is why I have started the TIGON to see just what is possible from a range and performance perspective.