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I think the difference is to high that it was caused only by the external variables.
I actually find this by accident because I usually refill my tank between 1/2 and 1/3, when the gas price was dropping. I was also satisfied with my "usual" 35mpg.
But three weeks ago, I had a very long trips with my car and I took this opportunity to see what was the "precise" mileage I can get with a "full" tank. To my surprise, I was able to reach 750km with 42L (95%HWY, 5%city). I was sceptical at first, so I did lots of "refill" next two weeks to see what is the " average " mpg of my car. But I was unable to produce the same or near the mpg with the full tank.
So to make sure I'm not hallucinated, I decided to recheck my mpg with another long trip.This time, I brought few measurement gadgets with me and avoided as much as possible immeasurable variables. For these:
- I brought the torque pro with me for average and live "mpg".
- Avoid as much as possible city driving (2%)
- Same gas station, same pump and two clicks
- Use the same roads for the return trip
- Same travel speed 60mph
This time, I was able to produce the same result (765KM/41L)
So far, I was unable to find what cause this big mpg difference between refilling an empty tank and a half full tank. This is the reason why I ask you guys if some of yours experience the same situation.
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