Owned truck 6 mo now, 6. 7 automatic, 1st the electronic throttle sensor, then 02 sensor, thermostat and now the ck engine light keeps coming on. 5 flashes,mpg has dropped from 18 mpg to 8. 9 mpg and nobody seems to know what to do about it. drove it less than 70 miles after last flash and the engine light is on again. is there any fix to it? it is breaking my pocket i want to retire but i can't. what happened to the 300,000 - 500,000 miles?