Hi

[jorgemiguel4]

I'm the proud owner of a VW Golf Mk4 TDI, want to improve it to achieve better fuel economy.

[Daox]

Welcome to the site. It looks like you're already getting some pretty decent fuel economy with your Golf. What kind of goal are you looking to achieve?

[jorgemiguel4]

Thanks.

I would like to get at least something like 4L/100km (~60MPG) at 110km/h it would be awesome. Engine ECU is already tuned, there isn't much to squeeze there. Air-conditioner compressor internal control valve is modified to slightly higher suction and lower head pressure.

Now I was thinking mostly in stealth aero mods, like dams or flat under body.. but don't know where to start.

[Daox]

This is a great place to start:

https://ecomodder.com/forum/fuel-eco...ifications.php

[cRiPpLe_rOoStEr]

Originally Posted by jorgemiguel4

Now I was thinking mostly in stealth aero mods, like dams or flat under body.. but don't know where to start.

I was told it's harder to certify the compliance of some mods in Portugal than in Spain. But anyway, if you're considering some discrete aero mods, what about a grille block? Besides improving the aerodynamics on highway, it may lead to the engine reaching its optimum temperatures quicker.