No. 29 is too low on a 44 tire!
If max is 44 then 40 will give you the best economy but a somewhat rough ride. 35 Will give you a smooth ride but a little less mpg.
The best rule of thumb is to go about 4 below max that way you get a full contact patch of rubber---safety first!---and still have some room for expansion due to heat and rough road conditions.
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