How Bigger Tires Affect MPG And Speed In A Car

Some motorheads want big tires for their vehicle either for off-roading or to add beauty

Hummer H3/ Motor Trend

It is obvious that bigger tires are heavy so they would require more power to rotate which will decrease the vehicle's fuel economy

Bigger tires have larger surfaces in contact which means more resistance will be experienced by the vehicle, thus decreasing MPG

Bigger tires also reduce the vehicle's aerodynamics resulting in greater air resistance and reduces speed

As the diameter of tires gets bigger it leads to a reduction in starting acceleration.

Installing bigger tires may lead to poor speedometer reading as well.

Using bigger tires may lead to decreased fuel economy

Moreover, these mentioned variation is more prominent while driving in the city rather than on the highway