[MaxMatt]

Hi there!

I have been reading the forum for quite a time now and finally decided to start posting. My cars are not what You'd consider a typical ecocar. Nevertheless I want to get everything that's possible from every fuel drop.

My most FE car is 89' MB 250D with 2,5 l NA diesel.

I managed to get 5,3 l/100km in the best Highway run and 6,5l/100km average (36,4 MPG).

My daily driver nowadays is 93' MB 300E 2.8 l petrol. It averages 10l/100km (23,6 MPG) - that is the one I would like to improve most.

The other car is a classic, but if it can be more efficient and less poluting - why not do sth about it?

It's a 71 Cadillac Eldorado 8.2l averaging about 25l/100km (10 MPG)


I don't really know where to start. On the diesel Mercedes I have a K&N air filter and carbon fiber fenders. Also it's running on fully synthetic 10W40 oil.

To the petrol Merc I did similar things, that's K&N filter and synthetic 5W50. Still I think it's drinking too much.

What is it about the ignition timing? Here in Europe the normal petrol is 95 octane and what You can get is 98, 99 and even 100 octane.

How much can I advance the spark (ei. on the Cadillac) when running on 95 or 98? What possibly are the gains?

Enough of that. It's good to be here. I'm really keen on hearing some good advice.