Those with 24's

[Doubeleive]

changing your rims isn't going to make a 5mpg difference, changing to some crappy brand of tire and running improper tire pressure could make some difference

 

[noob]

changing your rims isn't going to make a 5mpg difference, changing to some crappy brand of tire and running improper tire pressure could make some difference

I'm POSITIVE it affected my gas mileage for 1. I owned the car for 7 years and use the same gas and monitor my tire pressure. Plus rotating mass/weight takes a bigger toll on your car/drivetrain then weight that the suspension supports. Heavy wheels takes more inertia to get going and stop. That's why drag racers ride on little aluminum wheels, with thick soft compound rubber. Not Large wheels and skinny stiff tires.

Here's a good read for you, from a reputable site with actual data.
https://www.caranddriver.com/features/effects-of-upsized-wheels-and-tires-tested

They noticed a 10% drop going from 15-19 inch. We are talking about wheels in the 24 inch range, and 10-11 inches wide with tires in the 295-305 width

 

[Doubeleive]

I'm POSITIVE it affected my gas mileage for 1. I owned the car for 7 years and use the same gas and monitor my tire pressure. Plus rotating mass/weight takes a bigger toll on your car/drivetrain then weight that the suspension supports. Heavy wheels takes more inertia to get going and stop. That's why drag racers ride on little aluminum wheels, with thick soft compound rubber. Not Large wheels and skinny stiff tires.

Here's a good read for you, from a reputable site with actual data.
https://www.caranddriver.com/features/effects-of-upsized-wheels-and-tires-tested

They noticed a 10% drop going from 15-19 inch. We are talking about wheels in the 24 inch range, and 10-11 inches wide with tires in the 295-305 width

they measured a 10% difference which for this criteria is a measly 1.5mpg give or take. presuming you got 15mpg and it doesn't state if they corrected there calculations based on actual mileage or just going off the speedo which is going to be off just as much because of the wheel size, just like my truck was delivered with 18" wheels and now has 20" wheels and so the speedo is now off by about 2mph