Thanks for your input. I think 100 hours is good measure for an engine to be fully broken inNever noticed any of mine using more or less fuel during break-in, though I suppose that's possible. many maun's consider an engine to be broken in at approximately 8-10 hours (why they call for the first oil change then BTW), but most aren't really broken in well until around 100 hours of use.
Thank you for your input. I got a new Gravely this year and it used about five gallons in its first four hours of use. The engine wasn't working hard at all. I was merely trimming the heads off of weeds. When new, I think there's more fiction going on than we think, especially between the rings and cylinder walls. Your gas usage sounds like what I'd expect from a new engine. My engine is only at 14 hours now, so it has a ways to go before fully broken in.I purchased a Hustler Super Z with Kohler ECV860 engine last year. I checked fuel usage a couple of times. It was using 1.5 to 1.6 gallons per hour. I checked again a few weeks ago at over 300 hours. Usage was 1.29 gallons per hour.
Thanks for your input. That's what I thought.There will be slightly more fuel used during the break in period. This is due to the piston rings starting to properly seat themselves against the cylinder wall. Once the rings and the cylinder wall have become properly seated you will have an even usage of fuel.