Why do natural gas vehicles consume a lot of fuel after burning gasoline?

After changing automobile gas to oil, it will affect the sensor sensitivity of each engine, resulting in black smoke from the exhaust pipe, increased fuel consumption, unstable idle speed, difficult starting and so on.

The owner of "gas to oil" will not change much in the process of driving in urban areas, but there will be a mismatch between the two in characteristics. It is impossible for a combustion system to meet the use of two fuels at the same time. The modified cars basically use natural gas, so the engines are all debugged with the characteristics of natural gas. Using gasoline again will consume more oil than before.