How long would the car run for?

Vagcom said my bora was burning 0.4l / hr so around 137 hours to empty the tank completely! However, I never had it that hot the cooling fan came on and I'd imagine that may up consumption temporarily.
 
mine, a fair while, it might only do 24mpg but it does have a 55l tank, my old BMW, even longer, 80L petrol tank and 80L LPG tank :D (god i miss my e34), want another, but doubt i'd get it for £0 like the last.
 
I had our ambulance engine (Merc sprinter based) running whilst parked up for 10 hours on Friday night and it didn't use enough diesel to move the gauge.
 
Given it uses such a tiny amount of fuel when standstill and idling - it does beg the question if Start/Stop systems actually really do give you any kind of economy increase.
 
I used my scangauge to work it out. 10 gallons will last roughly 23hours. 2litre fiesta st mr200 which idles at 950rpm
 
unrealrocks said:
Given it uses such a tiny amount of fuel when standstill and idling - it does beg the question if Start/Stop systems actually really do give you any kind of economy increase.
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I read that on everyday hatchbacks, these systems can add around 5MPG to the "official" MPG figure. I'd be interested to know how long the average stop is on the official test. Where I live there are lots of traffic lights, but the intervals are quite short so it tends to be lots of little stops rather than a few long stops. I'm sure this would reduce the effectiveness of a stop-start system.
 
airwave99 said:
I read that on everyday hatchbacks, these systems can add around 5MPG to the "official" MPG figure. I'd be interested to know how long the average stop is on the official test. Where I live there are lots of traffic lights, but the intervals are quite short so it tends to be lots of little stops rather than a few long stops. I'm sure this would reduce the effectiveness of a stop-start system.
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I can see replacement starter motors wiping out the savings of the start stop system. Would be useless on my journey to work as I never have to stop but I guess they must save a bit of fuel!
 
unrealrocks said:
Given it uses such a tiny amount of fuel when standstill and idling - it does beg the question if Start/Stop systems actually really do give you any kind of economy increase.
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Especially when you factor in increased wear and tear on Batteries, starter motors(#) and other ancillaries!

(# I know not all stop/start systems use the starter motor)
 
airwave99 said:
I read that on everyday hatchbacks, these systems can add around 5MPG to the "official" MPG figure. I'd be interested to know how long the average stop is on the official test. Where I live there are lots of traffic lights, but the intervals are quite short so it tends to be lots of little stops rather than a few long stops. I'm sure this would reduce the effectiveness of a stop-start system.
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Look up NEDC graphs to see the speeds involved, something daft like 30‰ or more is spent at a standstill On the combined test, which is why stop start makes massive improvements in official figures
 
Well in real day terms, commuting within London (8.5 miles each way) the start/stop takes my 18.0 mpg average to 20.0 mpg. Based on the balance of 2 more mpg and the stress on components, the first thing I do when I get in the car is turn the start/stop off.

They say that any stop lasting more than 4s saves you fuel with start/stop, not sure how much truth there is in that?

If the system doesn't use the starter motor how is the engine restarted?
 
If start-stop only adds 2MPG when commuting in London, I'd imagine it would add less in other cities with less of a traffic problem. Definitely sounds like it's not worthwhile having it on, glad there's an option to switch it off.
 
Type_R said:
Well in real day terms, commuting within London (8.5 miles each way) the start/stop takes my 18.0 mpg average to 20.0 mpg. Based on the balance of 2 more mpg and the stress on components, the first thing I do when I get in the car is turn the start/stop off.

They say that any stop lasting more than 4s saves you fuel with start/stop, not sure how much truth there is in that?

If the system doesn't use the starter motor how is the engine restarted?
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IIRC it's something to do with detecting exactly the right amount of air/fuel to be injected into each cylinder (depending on the piston position), and using some fancy timing etc, to get the engine going again.
 
For stop/start systems that use the starter motor, wear and tear is possibly not as bad as you might think. An initial cold start will put a certain load on a starter and battery, but subsequent warm starts along the journey will be less so.
 
Well, my LS430 car can do about 866 Miles when full at cruising speed (70 ofc) so it takes twelve and a half hours to drain the tanks at 2200 RPM. This leads me to believe at tick over RPM which is ~5x less it should last 5x as long so two and a half days.

NB: I only have a C in maths, don't understand cars, and am "an idiot" :P
 
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