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There's an awful lot to unpack here.
First, do you have a 1500 or a 2500? The 1500 took P type tires and the 2500 takes LT type tires. Neither of those came with 285's, so it is a larger than stock tire.
What tire pressure?
And what is going to happen I think depends on the truck's gearing. It's clear that the highway fuel consumption will go down, but the commute is another story. If you can keep your foot off the accelerator and not try to compensate for the slower acceleration that taller tire will give you, I think you can get better MPG's - but that urge will be hard to resist.
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