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Unsprung weight, or weight not held up by the vehicle, (tires, and specifically, the rims) effects it because its like trying to spin the bike tire vs. the car tire. in order for you to spin your cars tire the same speed as your bike tire from them in a stopped position, it takes a lot more force to spin the car rim than the bike rim, even though the car's bearings might have less friction.
Larger rims heavy rims are harder to get spinning than smaller lighterweight rims, so more unsprung weight takes a toll on your engine when you are accelerating to speed. Thus you use more gas to get the larger heavy tire spinning.
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