That is a great fuel range, 900 miles is nice...
(Hope you guys don't mind but for us Diesel(VW) owners: tdiclub.com
There's a LOT of info...)
In my B4V (wagon), there is a 24-25gallon tank, that is a nice tool to have. Many a time, stopping for fuel was "passable" :-)))) lol
ALWAYS carry fuel with you when trying to make an effort on high fuel/mileage tanks, you'll be happy you brought some with you when getting to THE last drop!
On your VW, there is LOTS of room to go higher sidewall but keep footprint as similar as OEM, pump them things up and also add aerodynamics. ALWAYS keep the EGR/intake CLEAN, otherwise you have to push through junk, :-(
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