4 wheels are not gonna decrease your rotational mass that much, if you were that concerned like i said dump the spotlight dump the pushbar the steps and everything else because thats all unneeded weight as well.
all in all your driving a truck not a mazda, you wont have great handling if you want good mileage buy a little car.
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"and as mentioned, reducing drag and weight will net better fuel milage than saving 10 pounds of rims... especially when you factor in the cost of buying new rims."
Read the article
A difference of 10lbs can be a 10-15% rotational inertia difference, with the self-same benefits or penalties inherent to that. As I'm using the same tires, the lighter the rim, the better it'll be. At the risk of repeating myself, I would like to go with a better looking wheel (while maintaining the rim height/width/backspacing), but I don't want to increase the weight of the wheel. It isn't really a question of "getting better mileage/great handling", but that of pointlessly making something *worse* in the name of nothing but aesthetics.
Make sense?