Fuel consumption
Discussion
Guys, just carried out a fuel over mileage comparison. I believe mine is too low - around town 10 miles to the gallon. Could someone please let me know what the average is for an AJP 4.2 ? and secondly (if it is too low) the best method for increasing it. The car starts and runs lovely albeit with a little shunting at low revs and a slight smell of petrol, other than that fantastic!!!!!!! Any help and advice would be greatly appreciated. Thank you Graham.
I usually get up to 25 on a steady run and mid teens at other times. I'd be concerned over the smell of petrol. Exhaust fumes yes, but not petrol. Can you locate where the smell of fuel is coming from, front or back, inside the car, air vents etc... It is possible to have a pin prick fuel leak that is so small it creates fumes but evaporates before it actually makes its way to somewhere that you could see it (loose clip on the fuel lines maybe, or injector o'rings)?
pmessling said:
who cares its a sports car its never going to be economical just enjoy it i say.
WHSWhen I first got my car there was a strong smell of petrol when driving. I checked all the usual fuel lines which were OK (although I changed them all anyway). The last thing I checked was the small length of hose between the filler cap and the petrol tank. Mine wasn't fitted properly which meant the tank was venting into the boot / atmosphere. When driving the fumes were drawn into the car. Worth a check.
HTH
Ian
No idea what I get in the Cerbera. I assume not very much. My Golf gives me about 21 mpg with a mix of driving although if my wife then drives it she manages to balance it out a bit and get us 26mpg on average. Damn diesel Disco is about 24mpg. So I am relatively happy the likely 15mpg from the Cerbera. I can't drive the Cerbera gently!
Not sure anyone's really complaining about fuel usage. There's a difference between observation and obsession with it. I just like to have a ballpark idea of what's normal so that I notice if it becomes abnormal. 
If I had my way the car dashboard would be an array of instrumentation like a Lockheed Constellation's flight engineer panel. I like having data available - I'll decide whether it's relevant or not on my own
If I had my way the car dashboard would be an array of instrumentation like a Lockheed Constellation's flight engineer panel. I like having data available - I'll decide whether it's relevant or not on my own
Some good points-thanks. I understand that I am driving a very high performance car ( thankfully) and my consumption should be higher than a normal every day user, but my real concern is that if I can smell petrol I may have a problem which could result in a much bigger issue. Will investigate in more depth. Thanks again🏁
10 does seem very low, my long term average is 19 with individual tanks worth of consumption about 5mpg either side of that. Mine smells of petrol after running which I think is from residual petrol dribbling out the injectors after the engine is switched off. There is no smell while running or after it has fully cooled down.
fatjon said:
lowest 13, average 19, best 28.
The lowest was in heavy traffic 3 days, average is for mainly A roads and not much stop start. Best is 250 miles of very quiet Sunday motorways with a loose bonnet catch limiting me to 65MPH.
I second these figures as an average. In stop-start traffic with no periods of off throttle momentum to benefit from the fuel economy tanks as quickly as, well... the mood of someone in a ~200mph car doing 2mph behind a van The lowest was in heavy traffic 3 days, average is for mainly A roads and not much stop start. Best is 250 miles of very quiet Sunday motorways with a loose bonnet catch limiting me to 65MPH.
. One little addition, on the subject of 200MPH.
Yes, it will very nearly according to my GPS as I found on the A1 in Germany a few years ago but you can actually see the fuel gauge drop at an alarming rate, never had the opportunity to work out what it was doing to the gallon but my best estimate at the time based on the mileage covered and rate of drop was about 3 at best.
Also noted that at that speed when a big wagon pulls out on you even half a mile in front it's a proper brown trouser event and the brakes are a bit marginal.
Yes, it will very nearly according to my GPS as I found on the A1 in Germany a few years ago but you can actually see the fuel gauge drop at an alarming rate, never had the opportunity to work out what it was doing to the gallon but my best estimate at the time based on the mileage covered and rate of drop was about 3 at best.
Also noted that at that speed when a big wagon pulls out on you even half a mile in front it's a proper brown trouser event and the brakes are a bit marginal.
Think I used nearly 3 tankfulls getting from Calais to Le Mans one year in Cerb number 2. The convoy speed was very high. Got an indicated 185 (on a private stretch of road). You can visibly see the needle dropping. So I guess that was circa 10 mpg. So I suspect that only getting 10 mpg on a mix of spirited drives and normal road conditions suggests something isnt quite right.
So at minimum and maximum speed then, we can safely establish that they burn million-year old dead fish juice at a seabed destroying rate. We might between us all be able to combat the rising sea levels caused by global warming by doing as much as we can to deplete the bedrock oil pockets to the point of collapse.
My right foot and I are in favour of this idea.
My right foot and I are in favour of this idea.
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