Saint I always look on your MPG figures with envy, what sort of roads do you use most of the time? We can't seem to better 11 MPG on gas, but that is mostly stop start stuff in London traffic. The only time we see better than 15 is when we visit the Old's in Ramsgate which is motorway and duel carriageway all the way.
Its a multi point system that hooked up to a comp says is running as it should. I sometimes think I have the change over set too low so it runs too rich on gas when cold which kills the MPG.
To be honest the small tank (72 litres usable) doesn't help, at 11 mpg when you've covered 160 miles you're thinking of filling again just to find that sometimes only 60 litres goes in, so economy isn't always as bad as you think!!
90l tank - 72l usable...I get on average about 225 - 240 miles from a tank full
It helps that I drive gently, don't race, brake very very early, never leap off at the lights/junctions/roundabouts....I am not slow or hesitant, just smooth and road reading a long way ahead...
My Journey to work is 21 miles....8 miles are Country Lanes at a steady 40mph - 2 miles on a 50mph Duel Carriageway to the M25 - 7 miles on the M25 between J11 to J14 at a stead 50mph to J12 then 60mph to J14 then 4 miles round the Airport Perimeter to the office at 30-35mph and stop start between the Traffic Lights by World Cargo.
Journey Home is 21 miles either:
7 miles along the A312 from Hatton Cross to the A316 at Hanworth then A316 all along the M3 to J3 and off the A322 towards Guildford
or
4 miles along Perimeter Road to M25, M25 to J12 Staines, then off onto the A30 up Egham Hill past Holloway College, past Virginia Water, and then through Sunningdale and through Chobahm Village onto the A322 towards Guildford.....
I start work at 7.45 so leave before the main rush hour and usually finish at 15.45 so I leave before the main rush hour.
Journey time is about 50 minutes in the morning and 1hr in the evening.
The trick is to drive smoothly (not necessarily slow - just smmooth and anticipate the traffic and road read well ahead)
The worst I have had was 12.6 when on holiday in the Isle Of Wight with 4 fully grown adults in plus the Girlfriends enormous amount of camera gear in the boot....up hills and country roads stop/start etc....and I still managed 12.6 for the week we were there.