The average fuel consumption increases by about 14% when driving at 70 mph compared to 60 mph. This comes from a study that shows fuel economy decreases by approximately 14% when going from 60 to 70 mph on average for light vehicles. Additionally, some sources show roughly an 11-12% fuel increase at 70 mph compared to 60 mph in real-world tests. Fuel consumption at 0 mph is very different because the car is idling—it still consumes fuel but does not cover any distance, so fuel efficiency is essentially zero. When moving at low speeds (such as 1 or 2 mph), fuel consumption is slightly higher than idling but you cover some distance, giving a better mileage. Since the query asks about how much more fuel is used at 70 mph than at 0 mph, the comparison is less straightforward because 0 mph means idling with no mileage. However, compared to a moving speed like 60 mph, 70 mph uses about 11-14% more fuel. To summarize fuel use differences:
- At 0 mph (idling), the car uses fuel but covers no distance, so fuel economy is zero.
- At 70 mph compared to 60 mph, fuel consumption rises by about 11-14%.
This means driving at 70 mph consumes roughly 11-14% more fuel than driving at 60 mph, and obviously infinitely more fuel per mile than idling at 0 mph because no mileage is covered at 0 mph. If a more direct numeric comparison is needed (fuel used per hour or per mile at 0 and 70 mph), specific vehicle data would be required, but the general principle is that fuel consumption at 70 mph is significantly higher than at very low speeds, and idling consumes fuel without any distance traveled.
