[RedDevil]

Hi Joris, welcome.

You've set yourself a nice challenge. The Volvo 360 has some room for improvement on the economy side, to put it mildly
Especially since you have a 2.3 liter engine under the bonnet! That's not OEM, right?

One pic from Volvo 300 Series - Wikipedia, the free encyclopedia to show what we're talking about:



I'd say:
- raise tire pressure,
- smooth hubcaps,
- partial grill block except in summer,
- raise the back of the hood (does it hinge there?)
- Front 'splitter', basically anything that moves the lower end of the bumper forward.

It is nearly 30 years old, is it still in reasonable condition? Was it kept in a garage?

If you put your pictures somewhere on the WWW just paste the URL and a mod will turn it into a working picture link. Or post 4 more times and do it yourself