900 Mile tank on Jetta TDI

[bikeprof]

Here is a possibility for you to increase the MPG's by lowering fuel/RPM/tire costs...

I estimate ~2MPG+ if all remains constant(driving, speeds, nut behind wheel...) just by changing tires to slightly taller .66" but slightly wider .39" and instead of going 65MPH you'll be going 68.43.
That'll be just to start on your MPG quest and great if you need tires...
(PS. RPM's drop about 41, which makes the engine be at a better torque range)

In my VW wagon, I went up 4.5+ MPG w/small items :-)