My car's an odd beast. I've always figured it runs fairly lean judging by the look of the spark plugs. But what's stunned me is on several occasions now I've filled up with £20 worth of unleaded and had around 200 miles out of that! That's about 45mpg!! This is doing journeys between Devizes and Swindon at 50 and 60 mph. On the motorway you might expect good MPG at these speeds but this route includes several junctions and hills, plus town driving at each end. Mind you all my filters are very clean and the tyres are rock solid.

With unleaded fuel it's really hard to judge how a car is fuelling just by looking at the sparkplugs. It was standard practice to examine the plugs on a car running leaded fuels and set up the fuelling on the carburettor just like that, as gas analizers wern't exactly common back then, but now it really isn't. As an example i used to work with a race team running a few radicals. The fastest one we looked after was a Prosport with a 1550cc Suzuki engine running approx 250bhp. Now that thing was allways set up to fuel perfectly but the plugs were allways very very white. It's the same with most other well set up race engines, they can either be as black as the ace of spades or the complete opposite.

Sorry i havent really answered your question, just started rambling instead

I take it you are trusting the legendary Peugeot fuel gauges.....

Yeah the gauge of inaccuracies lol.

No need to apologise for ramblings, always like to learn something new.

keeping it below 3000rpm about 32 mpg...

daily driving is morelike 20mpg

The OE temp gauge in my 205 used to change it's reading depending on what corner i was going round...allways a barrel of laughs

Not really too bothered about the mpg personally but I did Bristol to Leicester and back last weekend on £45 worth of V power and didnt think that was too bad. I find keeping it below 4000 makes the fuel last longer, but thats just boring!

My son's Mi16, with 10.8:1 CR and Stage I cam, regularly pulls 7.1-7.2 L/100Km (40mpg) at 110km/h. A standard XU9J4Z only manages 8 L/100Km at the same speed.

According to the original brochure/manual, an Mi16 should do 41mpg at a steady 50mph.

my 2.0 averages about 1 liter per 10-11 km
But now with the avac problem and only incity drives 1 on 4km! thats crazy