Roof Box Fuel Consumption

But no matter how aerodynamic it might look it also alters the flow of air around your carefully shaped wind tunnel tested. He compared the gas mileage of his car at 54 7 mph 88 kph with 1 no roof racks 2 an empty roof rack and 3 a mountain bike on the roof rack. Roof boxes too are designed to be wind cheating so at low speed their impact on economy is negligible.

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A close second was the kayak with 28 percent or a.

Roof box fuel consumption.

How much does a roof box affect fuel consumption. The gear with the most impact were the dual mountain bikes strapped to the roof which impacted the fuel economy by 31 percent or 9 mpg. I regularly travel in france and germany and am concerned that a roof box might increase my fuel consumption and mean that i have to drive more slowly ab london sw14. A roof box we had a trailer before but hubby wants a roofbox now instead.

But the higher the speed the more affect they have. I need to buy a roof box for my 2003 audi rs 6 to accommodate my family s expanding paraphernalia. He found that compared to the baseline of no roof rack the empty rack reduced his mpg by 12 7 and the roof rack with a bicycle reduced it by a whooping 27 3. Adding any roof box increases frontal area of your vehicle of course.

For comparison the additional fuel consumption caused by roof racks is about six times larger than anticipated fuel savings from fuel cell vehicles and 40 percent of anticipated fuel savings. I know its not an exact science but curious before i splash the cash. According to used car buying guide parkers extra weight can reduce a car s mpg by up to 20 per cent because the engine has to work harder to haul it around.