Fuel Range

[Parthiban]

How far can the IS-F go on it's tank? And I don't mean driving it like a granny, if you drive it properly?

Looking at the mpg figures, it looks like it should be around 150-200 miles, is that about right?

[Looney]

Driving it properly can mean different things...

If you mean sensible non ragging it properly I'd say 200 is achieveable

On motorways cruising at 80-90 you'll do 250

If you mean making the MARRRRR sound at every oportunuity around town, on motorways and country lanes properly I would say 130 to 150 is the norm although I have managed to do a complete tank in 117 running only round town and sitting in traffic jams

[Parthiban]

Hmmm, sounds like I'd only get 150 out of it then max.......was hoping it was a bit better than that actually.

[fjcfarrar]

Hmmm, sounds like I'd only get 150 out of it then max.......was hoping it was a bit better than that actually.

You will notice that you fill up quite often - the tank is smaller than the IS200 for a start and the rate of guzzling varies more than on any car I've owned. On open roads with no flashing things or blue lights, you can easily bring it down to 4 mpg - yes 4. On the other hand, in traffic which is heavy but keeps moving 24 - 25 mpg is usual. My average is 18.5 mpg with lots of short runs, and this still reflects the early miles when it was stiff and drank like a fish. On really cold mornings, you can almost see the gauge move until it warms up which takes about 10 mins. To be honest though, I haven't noticed my fuel costs have risen dramatically over the excellent IS200LE whose older technology was not ultra efficient. A big bonus is that it takes fuel from the pumps much better and faster than the IS200.

[Parthiban]

Hmmm, that's an interesting contrast, especially that you haven't seen a big change from the IS200. However, that's a higher mpg than the Lexus quoted figures

[SINGH182]

seems about the same miles / mpg as a is300......good to know(better start selling my kidney so i can buy a is-f)

[fjcfarrar]

Hmmm, that's an interesting contrast, especially that you haven't seen a big change from the IS200. However, that's a higher mpg than the Lexus quoted figures

Lexus have revised their dreadful website and in the process got ISF details mixed up - for example the site says the ISF has 330 HP & 11 mpg combined! The official government consumption figures from www.vcarfueldata.org.uk are as follows: Urban (cold) 16.8 mpg, Extra urban 34.0 mpg, Combined 24.8 mpg. The US official figure is 24.5 mpg and the ISF is rated - believe it or not - as "Ultra Low Emission". Most of this is down to the absolutely superb auto gearbox which would be a revelation to you after the slightly indifferent IS200 auto.

Negatives: Your Granny will find it a job to get in the back. The exhaust note might annoy your neighbours when you start it up at 5am. The ride is noticeably harsh on knobbly roads. It won't fit in parking spaces which are fine for the IS200. It covers itself along both sides in brake dust.

Overall: Wonderful, just wonderful. Until the ISF, my IS200LE was all round probably about the "nicest" car I have owned. Yes, the IS200 was no ball of fire, but the subtle, classy looks, smooth & effortless drive, manufacturing quality and reliability made it outstanding in its class. The ISF is a tamed beast, docile and relaxing to drive in traffic, but with aggressive grunt that is pure fun when you want it.

[Parthiban]

I thought those official figures looked a bit off (they looked more like l/100km measurements rather than mpg......)

Thanks for the info :)

[3 MSF]

Chaps, I'm a little confused here...

150-200 miles from a tank of petrol just doesn't sound right from a design point of view. If we take some official stat's (which are probably a little 'ambitious'):

Tank capacity = 64 litres

1 gallon = 4.54 litres

Tank capacity = 64 / 4.54 = 14

14 gallons x 24.8mpg = 347.2 miles.

350 miles per tank seems a lot more reasonable, or is the 24.8mpg simply unrealistic?

- Mark.

[Parthiban]

It sounds like the 24.8 is a little unrealistic, but it appears that 20mpg isn't - which isn't too bad for 5ltr V8 (especially as I get around 20 out of my IS200 :shutit: )

[fjcfarrar]

It sounds like the 24.8 is a little unrealistic, but it appears that 20mpg isn't - which isn't too bad for 5ltr V8 (especially as I get around 20 out of my IS200 :shutit: )

Sorry, the site I gave for the official consumption figures was wrong and is rubbish. The correct site is vcacarfueldata.org.uk. This gives information past and present. All the figures are probably optimistic for real-world driving, but they may be useful for comparison.

MPG as follows: ---Urban (cold)---Extra Urban---Combined

IS200 Man 2003/4---21.4---36.2---29.1

IS200 Auto 2003/4---20.2---36.7---28.5

IS300 2003/4---18.2---35.3---26.2

IS250 Man 2006/7---20.9---36.7---28.8

IS250 Auto 2006/7---22.2---40.4---31.0

ISF 2008---16.8---34---24.8

The figures vary a bit year to year, and those for the IS 300 seem better than I remember them when I was thinking of buying one in 2003, but that is just probably my memory. Sorry it looks a bit of a mess - tried to put it in columns, but that didn't work!

[durg]

Ultra Low Emission Vehicle (or ULEV) refers to the efficiency of the catalytic converters fitted to the car and their ability to remove the unburnt fuel, carbon monoxide and NOx from the exhaust gas - in the same way cars in Europe are referred to as being Euro 5 compliant for example. For a long time carbon dioxide has not been considered a pollutant but this is changing.

Funny when you see it in relation to a 5.0 litre V8 though I agree :D

[Looney]

Sorry to burst the bubble guys but I doubt you will find an ISF owner who gets 20+mpg over any decent period of time.

Yes if you go on a 200 mile motorway cruise you can get 20+....but only just

The problem is that the noise that happens at 3800rpm along with the power burst and acceleration found over 5000 rpm becomes seriously additive and so i get an average of 13mpg and that is 50% motorway (15 miles per day) and 50% urban.

You don't have a car like the ISF to see how much fuel you can eek out of it...i did this for 2 years with my 220d which is what I chopped in for the ISF and was getting an easy 55+mpg.

The ISF is just too much fun and so really 15mpg would be the best yopu could hope for combined...unless you are 65 years old and use it to potter down to the golf club in non sports mode, and full auto mode.

The "Snow" mode is quite good at saving fuel as you only get about 200 bhp and so putting foot down has little effect.

"Sports" mode is much more fun !!!!

[kenfoxy]

Agreed. Fuel costs are a relatively small part of the running costs of an ISF, so you need to make the most of it. At least with the ISF, it is possible to get reasonable mpg when you forced to "follow my leader" on the open road which is more than can be said for some cars with the same performance potential.

[fjcfarrar]

Sorry to burst the bubble guys but I doubt you will find an ISF owner who gets 20+mpg over any decent period of time.

Yes if you go on a 200 mile motorway cruise you can get 20+....but only just

The problem is that the noise that happens at 3800rpm along with the power burst and acceleration found over 5000 rpm becomes seriously additive and so i get an average of 13mpg and that is 50% motorway (15 miles per day) and 50% urban.

You don't have a car like the ISF to see how much fuel you can eek out of it...i did this for 2 years with my 220d which is what I chopped in for the ISF and was getting an easy 55+mpg.

The ISF is just too much fun and so really 15mpg would be the best yopu could hope for combined...unless you are 65 years old and use it to potter down to the golf club in non sports mode, and full auto mode.

The "Snow" mode is quite good at saving fuel as you only get about 200 bhp and so putting foot down has little effect.

"Sports" mode is much more fun !!!!

Also agreed. All the figures can show is that if you drive the ISF to achieve what you can by driving an IS200 or 250 hard; it doesn't drink twice as much fuel - you do that for fun, but in those odd times when there is more month than money, you can can still get to work if you ease off. Great when you consider the last car I had with a 4.6 litre engine only managed 8 mpg at best on long, mainly downhill journeys and performed like a moped towing a wardrobe

[Parthiban]

Yep didn't start this thread to see how economical it could be, just what sort of economy to expect of an IS-F..........according to official figures and what others say I should be able to get 26-30mpg out of my IS200 but never had more than 22 from it.......

However, I'd imagine that as most of my driving is around town I probably wouldn't get quite as bad mpg out of an IS-F, with the IS200 you can still drive it pretty hard around town, but surely the IS-F has way too much power to be taxed at relatively low speeds?

[3 MSF]

Chaps,

you're probably aware that Evo are doing a really good long-term feature on the IS-F...

You might be surprised to see the last few months' fuel consumption figures:

Evo Statistics

Mileage this month: 703

Costs this month: £0

MPG this month: 24.2

Evo Statistics

Date acquired: July 2008

Total mileage: 16,759

Mileage this month: 2253

Costs this month: £0

MPG this month: 25.0

Evo Statistics

Date acquired: July 2008

Total mileage: 18,333

Mileage this month: 1574

Costs this month: £0

MPG this month: 25.2 :P

Getting more mpg as it loosens up? There's some very nice food for thought!

- Mark.

[simranjit Jhita]

I'm a new ISF owner, and my journey on the motorway this weekend i did approximately 150 miles and averaged 35.2 mpg!!!!! Granted i was travelling at lowly speeds of 55-70 mph with small bursts of acceleration every now and again. It may have added 15 minutes or so to my journey, but i was in no rush. From a 5.0 Litre V8 it's seriously astonishing!

[harey]

From experience the ISF has an excellent engine management unit. My Maserati GranSport 4.2L NA V8, average mpg 18. ISF 5.0L NA V8, average mpg 25.

[Tango]

Haven't really bothered to check the mpg as economy wasn't exactly what I had in mind when I bought the car, but on my occasional drive to the Company HQ I need to refill the tank after around 300 miles, although there's probably still a gallon in reserve. Journey is 100 miles each way and mostly dual carriageway, M4 and M3. Traffic conditions cause minor variation in average speeds, but the 300 figure seems more or less constant.

[Purvesh]

I'm a new ISF owner, and my journey on the motorway this weekend i did approximately 150 miles and averaged 35.2 mpg!!!!! Granted i was travelling at lowly speeds of 55-70 mph with small bursts of acceleration every now and again. It may have added 15 minutes or so to my journey, but i was in no rush. From a 5.0 Litre V8 it's seriously astonishing!

Wow, that's really good going!

[Mcauley]

so if i buy a is f should i get 20 to 25 mpg.

[Tango]

so if i buy a is f should i get 20 to 25 mpg.

Only if you resist the temptation to use all the acceleration that's available, or if you do fairly long runs, otherwise it's 18-20. If you drive it like a 250 then why buy the IS-F?

[Parthiban]

The thing is though if you drive the is-f in a way that would be the same speeds as an is250 being thrashed, which would use less fuel?

[Tango]

I can tell you, having had both at the same time...the IS250 would still be the most economical.