Nissan hardbody has 31x10.5's on alum. rims w/ 2.4 4cyl-Would going to stock tires increase fuel economy?

Q: I have a Nissan hardbody (D-21) 4x4 with 2.4 liter engine (210k),5 speed and it has 31x10.5x15's+aluminum rims on it.I'm thinking of getting stock factory wheels+using all season street tires.Will this improve the gas milage?By how much? I live in Seattle (hills)and do a mix of city/highway travel.I usually drive like it's Sunday,every day...

A: Yes it would increase MPG. A guess of gain is roughly 2MPG. That is about what I lost on my D22 Xterra when going from stock all seasons to 32" all terrains. It might be worth more on your KA24DE powered truck.

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