The 4250 should use less fuel than the 4430. I would be checking my oil to make sure there isn't any fuel going in there due to a bad pump. Make sure it isn't leaking anywhere. Are you getting excessive smoke? If someone has had their fingers in the pump and you are on the throttle a lot you could use a lot of fuel fast.
Are you using the 42 the same way and for the same things you used to use your 44 for?
The 4050 series was the series that Deere improved fuel economy by leaps and bounds, at least on the larger ones 4650/4850 I've never spent much time looking at the 4050-4450 but can imagine it's much the same.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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