Diesel Vs. Propane Vs. Gas - HDJ81 Vs. Suburban

[83bj60]

You can calculate out your engine efficiency from it's BSFC (unfortunately Toyota don't publish those).

Doesn't Hino make the diesel engines for Toyota?

Typical Isuzu 4BD1T or Cummins 4BT can do just under 220 g/kwh.
1 kwh is 3.6 MJ, diesel has 46 MJ/kg. 220g of diesel has 10.12 MJ

OK, got it. Thanks for the clarification

I have heard rumours of a 3.9L 4cyl diesel which can do 170g/kwh (46%) but I haven't been able to track down who makes it.

That would be a perfect fit for a vehicle the size of a Landcruiser...

Best figure I've seen for petrol BSFC is 250 g/kwh. Petrol has 48 MJ/kg which gives you 30%
But the best point for a petrol engine is a small target and it gets bad quickly when you leave it.
A diesel at worst point has a BSFC around 300g/kwh, a petrol at worst point is around 600g/kwh

I'm copying this great information for my records, thanks Dougal