That's a really good point. The LX2610 w/ cab is 700lbs heavier than my B2620 - then add an AC compressor on that.I'm wondering how big a load the climate control is putting on the engine...I think in a car it's 2-3HP mathematically. BX23 is 1,570#, LX2610 is 1,786 so that cab also adds about ~13% to the base tractor weight. Adds up quick when you're applying the load to a small engine.