I recently got a 2002 mondeo TDCI 130 LX 5 speed. I have seen on line that people can normally do 50+ mpg, but I am struggling to get 40 mpg. I am mainly driving on motorway and do about 80mph all the time.
The car just had a service done in the main dealer and I also used a wynn injector cleaner, but none of them helps.
Is there anything wrong with it? Shall I take it back to dealer where is going to cost £85 just for a look?
2300rpm at 70 is about right for a 5 speed, in my opinion the top gear is too high on the 6 speed meaning a change down is requied much below 60 where the 5 speed will pull hard in top at 50 or less.
The idle speed will only settle to 800 when the car is at standstill, even if it is rolling very slowly and out of gear the idle will rise a little, the ECU expects that power / revs will be demanded etc.
Nothing wrong with the gear box.
If you are driving it hard then 40MPG is not too bad though you should be able to average around 47mpg in mixed driving and 50+ on 70 to 80mph m/way runs.
Its the speed, theres a lot more air resistance at 80mph. Perhaps someone can come up with the formula to show the proportional increase in air resistance and power needed to overcome it as speed rises.
Had a look on the web and could not find it , but theres a graph on this on dave bakers puma racing site. Cant post link as permission and copyright is mentioned.
m - vehicle mass
g - acceleration due to gravity
theta - gradient of road
rho - air density
A - frontal area of car
Cd - drag co-efficient
V - car velocity
A - constant tyre rolling resistance term
B - tyre rolling resistance term to describe increase in rolling resistance with speed
This formula can be easily converted to an equivalent one for power (as in this case, power is just Force * velocity)
Good Evening, I have just been reading through all the threads and had to giggle to myself. I have a BEng in Electronics and Mechanical engineering with years of experience in the Motor Sports industry. I now run my own business in this field and I have to add..... there is no accurate way of measuring fuel economy and that's a fact. I wrote my final year project on the subject which got published in a highly regarded motor magazine ( I can't give the name for obvious reasons ). I looked at the formula which someone has put on here and found two main problems with it...Number 1, you can't really relate the mass flow rate of fuel in the formula to modern injection systems because of its very tight yet variable control of fuel. Number 2, vehicle mass, does this take into account the weight of the fuel in the tank and the rate of the fuel being used by the engine over a period of time......ie, the weight is decreasing as the fuel is being used. Basically, you could sit and try to work fuel economy out using various formulas and calculations but the fact of the matter is....fuel prices is the main factor of our economy!
I've got a 52 plate Mondeo TDCi 130 and I can get 510 miles on a full tank - thats doing naughtily fast on the A1 and minimal urban driving. However, I can't find how many litres my tank holds which isn't much good really, is it? Well at least I tried to help!
On any car a couple of litres will always be left in the tank when you run out of fuel and there will always be airspace in the tank even if you brim it-that is on any tank used since the 80's.On any common rail the fuel feed pump will shut down before it runs dry-to protect the pump and the rest of the system.
I had a 2002 TDI 130 for 4 years . I always used to get more than 500 miles to the tank and sometimes around 600 . I just used to fill to the brim and drive it until the warning light came on . I suppose I drove it reasonably carefully with the odd blast here and there. There was never much point in using more than 3000rpm. The trip computer was a little optimistic .. I think it claimed a little over 50mpg but I worked it out once and I think it was more like 47 or 48.
Definately reduce your cruising speed and see what happens.
I have recently bought a 2009 Mondeo Estate TDCI (140) withn the quoted MPG (combined) at over 53mpg. I don't drive with a heavy right foot so was surprised to see the MPG computer saying that I was averaging about 43 mpg. So I resorted to the old fashioned method of topping up, using a tank full and then refilling, and in reality my overall MPG is about 39!!!!
What a con! I would not have bought the car if I had known! I traded in a Toyota Avensis Estate, 2 litre 55 plate which returned without fail 47mpg no matter what sort of motoring Iw a doing and that is the quoted mpg. I couldn't work out how a heavier car with about 25 more bhp could return a better mpg and now I know the truth - it can't!!