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I fitted four conti 5s recently and best deal I found was with Merit

For what it's worth, I'm getting good results with the c250 version, averaging around 60mpg since new 40k miles ago, about a quarter of which has been city commuting.

Mine stays pretty constant at 90deg also and these warmer days it doesn't take too long to reach that mark. But I do notice the start/stop turns from green to orange sometimes without warning, even after driving for over an hour. I don't let it idle for long so can't help there I'm afraid.

Yes have kept a log on Fuelly and obc is 6-7% optimistic

I'm getting consistently good results from the BE c250 deisel, especially after the dealer re-flashed my ECU 17k miles ago which is when I reset the OBC. For m'way cruising the sweet spot is below around 1900 rpm (just over 70mph) above which it drops off significantly.

Each to their own but I recently had a system boiler installed and was advised to get a 22mm water feed from the mains rather than the existing 15mm. So not a cheap or simple option but I'm delighted with the result - mains pressure hot and cold taps/showers etc and can run multiple...

You may wish to check out what the various commercial resellers of parking spaces are charging in your area in addition to the small classified ads.

Might be worth checking whether they've replaced the injectors (several threads on this). Mine's a 61 plate and the main dealer swapped them for piezo ones at first service.

I've used this one in the past: Êàòàëîã çàï÷àñòåé Mercedes , ïîäáîð àâòîçàï÷àñòåé äëÿ Ìåðñåäåñ ïî àâòîêàòàëîãó.

12.5k seems low. In the 2 years from new, I've done nearly 40k on the original conti winter tyres and am just getting close to having to replace them (3mm on rears about 3 weeks ago).

I would recommend having the steel calculations done by an accredited bulding design / structural engineering company. This shouldn't be very expensive (guessing £200-300?) for a relatively simple job, especially if you don't trigger building regulations requirements.

I believe there were some serious injector problems with the earlier w204 models so yours may have been affected. Try here for official recall details although I'm not sure it captures ones that manufacturers don't report but get their dealers to fix during servicing: VOSA - Vehicle Recalls

You may want to check that your thermostat is working properly and lets the temp rise to around the 90deg mark as anything less seems to hit the economy pretty hard. Also, I had my injectors replaced under warranty around a year ago and they also reflashed the ECU and changed the wiring loom...

That might be me - I get good economy from my 2-yr old manual c-class, averaging 62 over long term and around 800miles between refueling stops. About a third of my driving is in town which brings the average down but 65-70 mpg on m'way runs is normal at legal speeds.

Agree with V12's comments above, also I notice a slight drop in mpg between summer and winter deisel which has been sold for over a month.

I agree with the various posters who have pointed to constant throttle being more fuel efficient than constant speed and that the two become very close when the road is flat and you aren't having to adjust for traffic. Interweb searches for nempi, hypermiling, wayne gerdes etc throw up much the...

Yes that's me, not all motorways and I have been known to exceed 65 sometimes :) Yes it is a manual - official figures suggest that manual and auto should return the same MPG figures, but I'm certain I would struggle to get these figures with the 7g auto.

I was quoting directly from the OBC which I reset when the injectors were replaced and ECU reflashed last November (this made a slight improvement) - pic below taken a few months ago. Am also tracking on Fuelly which gives an accurate figure of around 60mpg over the 37k miles covered since new.

Best I've had in my c250cdi (nearly 2 yrs old) is 83mpg. Average from new on mixed driving (mainly M'way and A roads but 33% urban) is 62.8.

I pushed hard for a deal on mine (same vintage) and got about £6.5k off list (paid cash).