g/kwh to gal/h

I am trying to compare fuel consumption ratings on Diesel electric generators
The american ones show gals per hour of consumption at 50% load 75% load & 100% load which is what I am familiar with.
All the other generator sets are rated by g/kwh which I think is grams per Kilowatt hour?
What I'm having trouble with is a gram is a weight not a volume? Do I multiply the total kilowatt hours which in this case is 60kw x the grams per hour(in this case 230) 60x230=13,800 grams
Do I have to figure out what a gal of diesel fuel wieghs? and the convert the grams to weight?

Any help would be great.
Thanks A+