How much wheel weight would be significant?

[TommyBronco]

The weight of rims and tires can vary greatly when going aftermarket or different options. And I know weight on can have a big impact due to the inertia of the rotating wheel. but how much of a variance in the total weight of a wheel would be enough to have a noticeable difference in performance. And by performance I mean MPG and acceleration. Would a difference of 5 lbs per wheel be negligible? How about 10? Is there a threshold number?

For example would I notice anything if I went with a steel BD wheel to the aluminum option? How about if I went from 265/70/17 Grabbers to a 275/70/17 similar tire? What about going to KO2?

This would be for the 2.3 man

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[KH_59]

The rotational inertia is affected more by tire weight, than by weight of the wheel. Tire distributors typically list tire weights....not sure about the comparative weight of the wheels, but I bet it isn't as much as you think. While alloy is less dense, it also tends to be a lot thicker.