This topic has already been chewed through several times, yet I would like to discuss this topic once again and present some theses that have not yet been taken into consideration. The already existing trimmings about wide tires are: -with wide tires one consumes more, …. -…because the rolling resistance increases -…because the air resistance increases -…because the larger inch rims are heavier -the acceleration is less I now have some other theses, d 1. Since the wider tyres in the majority of cases have a larger roll circumference, the actual speed is higher than with “standart tires”. This means that at e.g. 100km/h a real speed of 94km/h is driven according to the tacho with “standart tires”, with wide tires (due to the larger roll circumference) an actual speed of e.g. 98km/h is driven.–> The engine must do more at the same speed (additional consumption?). In addition, the odometer counts the same number of kilometers, but due to the larger roll-off circumference, I effectively cover more kilometers than with “standart tires”. Since I actually cover more kilometers, the calculation of the spritt consumption then makes with actually less indicated kilometers results in an increased (distorted) consumption. 2. I once weighed my 15″ aluminium rims with tires and my 18″ rims with tires. Result: The 15″ aluminium rim weighs about 14kg, the 18″ Alufelge weighs about 16-17kg. I believe that from this point of view no extra consumption (measurable) can arise. 3. As in contrast to a 195 tire, which is actually “only” 3cm wider, for example 225 tires, I can hardly imagine that this should increase the consumption by 0.5 to 1.0 liters. 4. Due to the larger rolling resistance also changes my overall ratio from the engine to the tire. Due to the slightly higher translation the acceleration is logically 5. In general, it can be said that most of the tyre’s rubber compound is decisive for consumption.