First of all, draining the gas tank all the way down till it dies is a big no-no.
The fuel pump pick-up will end up sucking all the crap that's concentrated on the bottom of the gas tank when you do this.
I would try and change out the fuel filter first...
Second, I dunno how good the 7-11 gas is over there, but I would never touch the 7-11 gas down here.
I always would use Shell, and if I have to, any of the name brand gas (i.e. Chevron, Unocal) before hitting any of the "generic" or discount brands.
-Ted
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