Better Figures then 900kms to a tank

[geoff_gti]

So about 3.85L/100 then if I've got it right? That is quite impressive!

[polo_spec_d]

Yeah thats right, pretty good I reckon, hmmm maybe long range tanks......

[silvershadow]

I filled the Eos on Christmas Eve to check the fuel consumption for the first time [MY09 TDI common rail DSG].

Distance travelled: 815 Km

Fuel used: 46.2 litres

Fuel consumption [metric]: 5.67L/100km or 17.64Km/litre

Fuel consumption [imperial]: 49.8mpg [imperial gallon]
41.5mpg [US gallon]

This was achieved with a mix of 80% country, 20% city driving with the A/Con on for about 50% of the time [the roof was down the other 50% - the car is the best drought-breaker ever, plan to take it out and it will rain every time] . Best instantaneous fuel usage figure on the trip computer observed so far is 4.1 L/100Km at constant 80 km/hr for 20Km due to roadworks [A/c on]. The effect of the airconditioning system appears to be around 0.2 L/100Km extra at speeds in the range 80/115 Km/hr.

Very impressive and will get better as the engine frees up [2400Km on clock so far] - diesel technology improvements now make the TDI a worthy alternative to be considered.

[blutopless2]

Remember that every time you don’t touch the accelerator pedal there is 0 fuel injected.

not quite... still need fuel to keep the motor running.

[gregozedobe]

not quite... still need fuel to keep the motor running.

not not quite, actually - Transporter is 100% correct - there is actually no fuel being injected when on the over-run ie the momentum of the car is keeping the engine turning over. So when the MFD says 0.0 l/100km it is exactly that. The injectors will start injecting fuel again when the engine is approaching idle speed to stop it stalling.

So if you time your run right you can back off as you approach a red light, and you are using no fuel whatsoever on the run up to the light. This helps fuel economy.

There are some that debate that if you lift off too soon you have to your foot on the accelerator again to stop slowing down too soon and this uses more fuel than putting your car into neutral and coasting in with the engine idling, and the even more extreme will switch their engine off (but I think that is crazy stuff, and totally inappropriate for driving on public roads ).

[Transporter]

not quite... still need fuel to keep the motor running.

Ok, when you decelerate the fuel delivery is 0.
Remember it is a diesel engine.

[blutopless2]

there is actually no fuel being injected when on the over-run ie the momentum of the car is keeping the engine turning over.

thanks for the correction.
Is it only the diesels that do this?

[gregozedobe]

Is it only the diesels that do this?

Exactly the same for TFSI petrols as well - no point injecting fuel if it isn't needed. The only down side I've noticed is in a very slow moving traffic jam - your accelerator foot can get a bit confused with the injectors starting up again at near idle speed.

[Vicbitter]

I don't see how that is possible? Driving my MY08 1.9 TDI Sydney to Canberra and back in one night, 100% highway, yeilded 4.94L/100km. If your car was a Bluemotion....

How many km did you travel and how many litres did you put in?

Maybe the car isnt run in yet, how km's on the clock have ya got?

[Mischa]

this is the best i've gotten from a tank. it was 90% highway and average speed probably 110. the other 10% was fanging it through melbourne lol.