Genghis - a "four tank" PA28?
I have never, ever, heard of a four tank PA28 (but that, by no means, dictates that there isn't one).
I used to fly a four tank (indeed, six tank) PA31 (commercially) - but have never heard of a four tank PA28.
Tell me more.
I was in the same Seneca as "Turkish" and, have to admit, it's a good question (as our conversation ensued).....WHY??
At least with the PA38 they moved it into the instructors eye line - but why a selectable tank?
Having said that.....a (rather gorgeous) aquaintance of mine did run short of fuel in a Cessna 172 at "half endurance" - when fuel only came out of one high wing tank and not both.
It may be easier, at 4,500 hours, to detect a roll due to weight imbalance than it is at a brand new PPL 45 hours.