How can I make a Mk4 Golf TDI less noisy (inside) - Any suggestions?

[Kerrse]

Hmmm ive done an 18mile 50mph drive up a motorway behind a tanker and achieved 80.1mpg wheres before it was 69.1mpg
Decat and panel filter are the only things that have been changed since.

You will have had less drag due to slipstream so would have used less fuel 

[vw-8v]

6. Put the lid thing back into the boot area (if I can find one!)

if you mean the parcel shelf then def get one as it cuts a lot of noise coming of the rear section of the car as at mo i have mine off as stripping interior lol again and on motorway noise level a lot higher than with one, cheapo fix m8 srappies

[Gareth F]

Hmmm ive done an 18mile 50mph drive up a motorway behind a tanker and achieved 80.1mpg wheres before it was 69.1mpg
Decat and panel filter are the only things that have been changed since.

You will have had less drag due to slipstream so would have used less fuel 

Last time it was a super market lorry