An N reg elite, good choice, I have an estate version of one of them (along with an S reg MV6 manual).
Now there are various little (and not so) jobs that will ensure you get the best "economy" from your car.
Depending on how mechanically minded you are, these will all help.
To start with. When was the cambelt kit last changed. Only accept a receipt or purchase from of our senior members as proof!
![Smiley :)](http://images.omegaowners.com/forum/smf2000/Smileys/oofstd/smiley.gif)
As you doubtless know by now, 40k/4years. Look for a water pump on the bill too.
Give the car a good service!
Oil (10w/40 semi synth or better) and filter. Air filter, fuel filter (often overlooked and can make huge difference!)
Spark plugs.
Pollen filter. At the base of the windscreen on the passenger side is a little flap in the scuttle. Lift this up and under there "should" be a filter. This also "should be white! If it is actually there, I suspect it will be a rather darker colour!
Also check down in the area below. There is a drainage hole down there. If there is water, then the hole is blocked and needs clearing (yuk).
Coolant flush and change with 50/50 mix
Clean the breathers. This is easy. Leaking cam covers (pull a spark plug lead if is it soaked in oil?), a common issue, are caused by blocked breathers.
Once these are done, you will be most of the way to ensuring your car is running superbly.