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With that commute, weight is hardly a factor in fuel economy. Improvements in F/E will be all about wind resistance and rolling resistance.
So you want to get the largest possible tire under the fenders - and the best way to measure that is by load carrying capacity (Load Index). Then select a tire line with very low RR (That will be difficult as there is very little published comparing different tire lines.)
You will have to be very careful in tire selection as parts of Texas use asphalt that gets extremely slippery when wet - reported to be similar to ice.
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