Fuel Economy Roller Coaster

[JWerkheiser]

I just went on a road trip this weekend. Filled up, left town, driving all interstate 70-72mph. Topped off after 180 miles, calculated 13. 9mpg. Same driving conditions, got 17. 5 last 100 miles. Stayed at 17. 5 for return trip also. Getting bad fuel? Interestingly, it was like magic as soon as I left the first station, overhead mpg went up instantly. Almost like turning the truck off at the fill up then starting it back up made a big difference. If it was fuel, I would have thought it would have taken some time for the "new fuel" to get into the system. Am I losing my mind?

 

[Mathew Clausen]

My guess ....

Your "home station" fills pretty fast, causing more foam and shutting off a little early. Then after 180 miles that station filled slower (or was set different) and filled to a higher level - giving a false amount. This serves to make this fill look bad, and the next fill look good .



Or ... it was very windy for the first hundred miles or so.



Mathew

 

[joeyou]

Your "home station" fills pretty fast, causing more foam and shutting off a little early. Then after 180 miles that station filled slower (or was set different) and filled to a higher level - giving a false amount. This serves to make this fill look bad, and the next fill look good .



Or ... it was very windy for the first hundred miles or so.



Mathew

You can't really tell much running 100-200 miles per fill up. You have to check after running near empty to get a result that means anything.