[Rich Biebel]

Rob I do not have any ideas why your generator would use more fuel than what is listed in the manual.

I am guessing it is a fixed speed model and has a Kubota engine.

They do also use Isuzu's in some models....both are good engines and very reliable,,,

I would have to look at the Service Manual or parts manual for some info on the injection pump and how it is controlled vs the load on the engine....

I have never really tested one for fuel usage and never really saw one with oil dilution from diesel fuel either.