He doesn't need to actually drive that trip to be skeptical of your claim of a thousand miles on a tank of gas. Frankly, I'm skeptical of it too.
Okay, but you're claiming double that. Not 10% more or 20% more - double.
No. I'm claiming I got to Phoenix on half a tank of gas which is entirely doable and possible, if you know how to drive properly on freeways. Lead foots won't pull it off. Just because I got there with half a tank to spare after 500 miles does not automatically equate to 1000 on a full tank. Again, you people need to stop riding the numbers. It's not that simple.
After I got to Phoenix it was all city streets. The remainder of the gas burned out rather quickly. I'd say I was able to do a total of about 600 miles when it was all said and done. Again, the car is not burning gas if you're not pressing the accelerator. If the car is already going 80 MPH on a stretch, there's little need to press the accelerator constantly. All you have to do is tap it every so often to keep the car's momentum going, but in the meantime you're still traveling 80 MPH. You might only burn a quarter's worth of gas if you know how to not ride the accelerator.
Point being - it CAN be done, so don't tell me the Altima is less efficient than the Versa.