Dragoon said:
I actually run on reserve for 20 miles after I fill up because I have read that that is a good practice to ensure you always use fresh gas. I get exactly 120 miles before I need to switch, but I always fill up at about 100 miles because this is a great number for which to calculate your actual MPG.
Enjoy
While it certainly isn't going to hurt anything doing it that way,
you aren't really accomplishing anything either.
If you stop and think about it, your tank is a once piece tank.
Switching to reserve "to keep fresh gas in it" isn't doing anything.
When you hit reserve and switch over, you are running on the same
gas you were running on when in the ON position.
When you pull in to a gas station and fill up, all that gas is going to get
mixed up simply by filling the tank.
Running on reserve after a fill up is going to run on the same "mixed"
gas as if you were turn it back to ON.
Gasoline mixes with itself, the old doesn't sink to the bottom while
the new sits atop.