What causes high rolling resistance in a car?

My Infiniti FX35 seems to have high rolling resistance. By which I mean it loses speed and momentum very quickly as soon as you let off the throttle. Even when going downhill I find myself needing to press the accelerator or else the car loses momentum very quickly.

My brother's 2012 Honda Accord behaves in a very different fashion, as the second you let off the brake the car rolls at like 5-10 mph without even touching the gas. Once I'm up to speed I only need a very small application on the accelerator to maintain that speed. If anything I need to apply the brakes significantly more in that car as the speed can sometimes increase significantly on slight downhill slopes even without any input on the accelerator. The two cars behave very differently in this aspect.

What causes high rolling resistance?

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