[Caddylackn]

Get a Scan Gauge II or Scan Gauge E; This will teach you where all your gas mileage drops come from and your mpg gains. Set the gauge up to show boost, instantaneous mpg, and trip mpg. Drive to minimize boost on cruise and accelerating. Run fast downhills to coast. I picked up 20% gas mileage gain just learning to drive with the Scan Gauge.

Leave a good gap in front of you so you can minimize using brakes in traffic.

Following a car 25' behind in the fast lane is the worst for mpg. Lots of acceleration pulses. You want superlight steady pressure on the accelerator.

Don't use cruise control unless its super flat.

Run max tire pressure or a few psi under it.

Check for emergency brake drag and wheel bearing drag. Your emergency brake tightens the rear disk calipers on a VW by rotating the caliper piston when using the e-brake for when the brake pads wear but every time it rotates a click there will be brake drag. I only use my emergency brake once a month or so unless needed on a steep hill.

Aeromods as needed.

Get good new injector nozzles. Old injectors waste fuel. Is your intake clean or gunked up from EGR?