I filled up with 294.3 miles on the tank. It only took 16.040 gallons, so that leaves like 2 -3 gallons left. So that is what 18.33 MPG. So yes, it can be done. Like I said, I did those steps I listed above and in my case, it added 30-40 extra miles to my tank before fill up. BTW, the light came on at 285 miles.