This iGEN2500 unit replaces a Cart Gen that gov't paid for, from the 2005 hurricane season which served well over the years, but, the five gallon per 12 hour gas consumption was the reason for my igen2500 purchase. And, as having limited strength after back surgery, the Cart Gen's several hundred pounds weight made for a difficult time in setting up backup power. Since I only needed to sustain the two major appliances that are mandatory during a hurricane induced power outage or other, the fridge and a window AC unit, this Westinghouse unit is PERFECT.... I did some start/run current measurement testing for the fridge and AC with a "peak/hold" clamp on current meter and verified my intended load(s) would work well with the 2500. The fridge start current measured ~ 6.8 amps, with only ~1 amp running. The Window AC, (LG LW6017R) - 6000 BTU unit measured ~ 13 amps starting with an average 3.3 amps running. These measurements were made running on the iGEN2500 power to ensure the start currents were OK. The 2500 has the reserve power to start my Window AC with only the monetary "kick on surge" to get up to speed. With these two loads, (and a handful of LED lights), I am expecting the ten hours per tank/gallon of gas as this load is measured at about the 25% load rating. So, if you are in need of CLEAN sine wave power during a power outage this iGEN2500 is just the ticket.... It is recommended that you use the supplied oil - for break in and being a "bit" an-l, I changed the oil after only a 15-20 minute warm-up just to give a clean flush before the break in.and refilled with a regular oil during break in Be certain to let the gen warm up at least 5 to 10 minutes if possible to prevent a "hard-ON load" when first started - just common sense.... After several break in oil changes with VARYING LOADS, hitting 1.97 KW output without any problem for a 5-10 minute run. (Always cool the gen running with NO load for ~ 10 minutes before shutdown). I am now running Valvoline Full Synthetic High Mileage 10W-30 oil with supposedly the extra additives that provide the best protection. Again, oil is cheap, even full synthetic, so change it often. P.S. Do NOT buy/use any "synthetic blend" as these are rip-offs often containing less than 10% synthetic oil but at darn near the price of full. Buy FULL SYNTHETIC only. AND, do not be cheap, use ONLY E-0 Ethanol FREE gas for this and ANY gas powered gear you may have. Lastly, use a gas stabilizer in the fuel also. I keep my generator tank near full for storage as I am a believer to keep the seals and gaskets "wet" so as to not dry out and very probably leak when filled with gas. NOT a ding on Westinghouse, it is just a practice I perform and I know that my IGEN2500 is ready to fire, with only one pull - every time.