It's difficult to quote fuel usage for an unidentified genset: gensets range
in size from 1 KW to 20+KW and come from a variety of vendors whose engines
vary greatly in the volume of fuel used/hour. As a "rule of thumb" you can
figure on ~1/3 higher fuel consumption for an LP motor over gasoline and
~10% lower out put power from the genset.

As an example, my gasoline-powered genset uses 1.2 GPH to produce 7KW while
the LP-powered version uses 1.6 GPH to produce 6.3KW. Since my trailer only
carries 12 gallons of LP but 30 gallons of gasoline, it should be no
surprise that I never was interested in an LP genset. <G>

Most, if not all, LP gensets use motors originally designed to run on
gasoline. The service life of the motor is not dependent upon which fuel is
used.

How much LP will it burn? That depends on which generator you have, and how
much (average) load you are putting on it. As a starting point, find out the
make and model of the genset, and look it up on the manufacturer's web
site - they'll have figures for fuel comsumption. Use the figures for 1/2
load until you find out whether -your- average load is more - or less - than
that.

All RV LP gensets that I'm aware of are (manufacturer) conversions of gas
gensets - so it should be just as (mechanically/electrically) reliable as
the equivalent gas genset. If your LP tank is large enough, you should have
no problems 'running it all day like on a gas unit'. Do note, however, that
LP gensets -can- have problems in cold weather - when the liquid in the LP
tank doesn't vaporize fast enough to keep up with consumption. This is a
variable that depends on the LP blend in your tank, the size of the tank and
genset, the load you are putting on the genset, and the tank temperature.
Usually not a problem until temps are somewhere below 40F, but something to
be aware of if you're planning on using it to go ice fishing.....

Alan