Can you save gas in a vehicle by using energy coming from the tires?

So you want to use gas to power the engine which would power the wheels which would power the engine? I sense a flaw in your plan.

air filled tyres already return energy to the wheels by absorbing bumps and returning most of the energy when the road levels.

fill your trunk with batteries and put an alt on each wheel to charge the batteries but you will need an elec. motor too

I think the windmill way might cause a problem… In order to catch the wind, you would need something like a fan blade, which in turn would add resistance and drag. This additional drag would then need to be overcome by the engine.

However… Think of spinners that you can see on some cars… IF the spinners were designed with magnets on one side and metal on the other you could create a sort of genorator effect..
Now i’m not sure what the resistance would be in a case like that, but i have to imagine if it were to work, that would be the best chance of it working.
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TM , Copyright.

Yes you can take energy from spining tires, but that also means you take energy from the engine at the same time.

A quick background first. The tires dont move by themselves, they are are pushed forward by the engine of the car. (obvious)

You’ll know if you’ve ridden a bike, that you dont just push the petals and go, there is resistance. Also if you dont keep petaling then you’ll slow down and eventually stop.

An engine works the same way. It has to keep going and going to keep 3000lbs of car moving.

Your idea is partially correct. You can (if you have the skills and equipment necessary) attach a generator or something of the sort to the axel or transfer case of what not to create electrical power from the wheels.
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Now here’s the wrong part. If you do this, then every time you try to use that energy, you’ll put an electrical load on the generator, effectively putting slightly more load on the car’s drive shaft or w/e you have it attached to. This will make the engine work a little harder as it now has to push 3003lbs of load instead of 3000. If you have a large appliance connected to it, the electrical load could make it upwards of 3200lbs of resistance.
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If you want to see it for yourself, then run your air conditioner while driving down the road and listen for a very slight change in the engine noise for a second. The engine will rev when you turn it on, as the air compressor turns on causing the engine to slow down because of the resistance. The revving you hear is from the engine trying to catch back up to itself, but that requires more fuel.

In a short answer now that my explanation is done.

No. You cannot save gas in a vehicle by using the energy that is outputted by the tires.

You will in fact consume more fuel to create the extra energy.

It sounds you are trying to get free energy from your tires by adding a generator but the idea only works when you are going downhill. Try adding a solar panel and hope for a sunny day. The less of a load on the alternator would save a bit on gas.