I am concerned about fuel consumption in my L4330. I primarily use my tractor for mowing with a 72" finishing mower. it seems that I am using 1 1/2 - 2 gallons of fuel per hour and I think that is excessive in comparison to some of my friends with John Deere tractors. One guy has a John Deere 5055 and he used about a tank of fuel in 31 hours. Am I expecting too much?
I have a 27 hp CUT Kubota with HST. The fuel tank is about 7 gallons. The other day I ran about 6 gallons of fuel through it in about 6 hours. It was pulling a landscape rake running near full throttle working hard moving dirt. Then on the following Monday (Labor Day) did the same job but at about 2,000 rpms and dirt was easier to move and the fuel used was about 4 gallons. At same time had a 68 hp Kubota with Manual Trans. On each of those days it was used to pull about 6 to 8,000 trailer loads of dirt with it running about 1500 rpms when moving and then ideling for a while to be loaded. It probably used about 6 gallons each day while over twice the hp. But oh the load difference. On the tractor I have run it at least 20 hours on the 18 gallon of fuel and then with real heavy work had to refill to finish a 10 hour day. Many people miss the load on a engine when telling how great they are at fuel.
On old carbureted gasoline tractor engines fuel consumption could vary quite a bit from brand to brand with like loads. On todays modern diesels and even the fuel injected gsaoline engines in pickups the fuel consumption rates are about 98% controled by engine size compared to the the load, operator habits, working conditions, etc. I think the fuel consumption rates from brand to brand under like conditions are so close that it wouldn't be much of a factor in brand choice.
Murf using your formula I come up with 3.5 GPH for my skid steer. Since I'm getting .6 of a GPH better, is it likely due to the turbo giving me better consumption?And this formula really doesn't apply to motor vehicles, right?
Jeff, it's possible that the turbo is responsible, but that's about a 17% gain and I doubt it would have that much effect, I'd be thinking more along the lines of half of that.
I suspect it's more likely due to a combination of the turbo and that NH doesn't set the throttle handle on the SSL to give you WOT but more likely at about 80% power for engine longevity.
The formula applies to all 'modern' diesel engines, but the over-riding part of it is "at peak power", It's rare that you'd be running a pickup for instance at WOT for very long.