Onan Quiet Diesel 7500 consumption

[mchero]

Have the above in out 07 Discovery. What are others using for diesel consumption numbers when determining MPG on your rig.
Xantrex Freedom 458 used to charge 464ah of wet cell interstate 6V batteries.

Thanks

[mchero]

Thanks for the great responses folks.

[Trackrig]

We have the 2005 Excursion with the Onan 7500 - basically the same as your rig. I'd say we're using about a half gal per hour when both ACs to are on - that's when the generator is running full tilt. Other times may be a little less. It's hard to measure as you always have drive to and from where you're using it.

Bill

[MEXICOWANDERER]

The way to gen set prime mover economy is two-fold both offset by trade-offs and compromises.

3,600 RPM is awful. Two pole generators suck for economy. 1,800 RPM is more common. Fuel economy improves 5-8%. A six pole 12-turn gen set is the best. 1,200 RPM but horribly big and heavy. 12-turn is ideal for long run times.

Coolant versus air makes a huge difference in economy. This is why VW was forced to change. Efficiency was so poor emissions could not be controlled. Today's water cooled cars could haul a beetle on their roof, pass another going uphill and get better fuel economy doing it all the while.

A water-cooled direct injection Honda 2000 would use about 65% of the fuel of a standard Honda.

[mchero]

Thanks all. Appreciate the response's!

[lj2654]

I only use about 1/2 gallon an hour while running both roof airs and my refer while traveling with the same genset you have.

[Ivylog]

The numbers I've seen on here is more like 1/2 gallon/hr for one AC and 3/4 for two ACs... not enough to worry about.

[Fishinghat]

As a rule of thumb, I use the one quart an hour estimate. That's what I was told the 10K diesel generator in my coach uses by a Onan technician at a rally. I can't believe it is that little, but possibly so. I'd even be happy with a one gallon an hour usage level.

I've used the generator on trips to run the house air conditioner and while dry camping out in the desert in Arizona. I never noticed any change in my fuel consumption overall and with a 150 gallon tank, I couldn't tell any change in the fuel level gauge after boondocking for several days and running the generator for several hours twice a day.