My Yuling pickup truck is dual-purpose for oil and gas. Now it runs 80 miles at most. Why?

My Yuling pickup truck is dual-purpose oil and gas, and there are many reasons why it can run 80 miles at most now.

In this case, if you have time, check the engine system with the computer to see if there is any fault code. Actually, just check the cylinder pressure.

There are also three-way catalysis of oil flashover and exhaust pipe to see if there is blockage and poor exhaust, which leads to insufficient power and can't run.