Mpg

[Joglesby]

Loving it !

However I have noticed some mpg figures on this site, one which said cant get less than 52.

Mine has only done 800 miles so far but have been drinving steadily although in the last week have

used full bore sometimes.

On runs of around 35 miles on A roads I struggle to get 50.00 (best is 51.1).

What am I doing wrong or will it loosen up with more miles.

Mine is an es ES with 16" wheels and pressures on higher for economy.

[Blisteringblue]

3600 miles driven now, and I honestly struggle to get less than 55 mpg. 58.9 today on the M62 over to Hull thanks to the nice roadworks section at 50 mph.

I am 90% motorway though, which does seem to make a big difference.

[Richard1200]

Mine is 47.7mpg over 4000 miles and one year. No motorways just local and A roads. Very happy after my IS250 was about 24mpg under similar conditions. Need to get the hand book out as I believe there is a mpg since refill somwhere on the display.

[Wicksy]

42.2 is the best I can get out of my F Sport - still very happy with that though.

[DJP]

41 for my F Sport. Mainly around town driving. Not quite nose to tail electric friendly traffic but still twice as good as my 250. On a run that takes in dual carriage/motorway driving upper 40's early 50's not a problem. I'm also big into the air con and ventilated seats which won't help the economy either.

[ColinBarber]

http://www.lexus.co.uk/hybrid/#/AboutHybridDrivingTips

this is the main one:

• To accelerate with optimum efficiency, use full throttle for a short burst of maximum power. When the desired speed is reached, lift off and immediately press the throttle again to put the meter in the eco zone to maintain your speed.

I would amend that to read, lift off completely and then press the throttle again gently.....

[UnSean]

Hi

Just took delivery of an F-Sport today, drove 110 miles, with a mixture of town and country roads, no duals or motorways.

I had full air con and cooling seats. I gave it the gun a few times and dabbled with some Eco driving.

The tank I assume was full, it's still showing full with a range of 618 miles and an ave of 52.3mpg.

I am pleasantly surprised, it beats my 15-30 disco 4 on the same trip.

[Joglesby]

Thanks for the tips etc. Try the accelerate harder and lift off and see what I get !!!!

[DTH]

1500 miles in two weeks and the mpg now fluctuates between 57.0 - 57.3. I never thought I'd be happy tootling along in 30mph traffic jams before now!

[DJP]

1500 miles in two weeks and the mpg now fluctuates between 57.0 - 57.3. I never thought I'd be happy tootling along in 30mph traffic jams before now!

I know, it does that to you! Heavy traffic and see how far I can go on electric only is a new pastime lol.

Sent from my Iphone using Lexus OC

[tinka]

59.1mpg on the journey home from swindon to kent, mainly motorway, which is impressive, as it would of been using the engine, most of the time.

It's dropped to 55mpg now, I'm still amazed. What a great car.

[Joglesby]

Thanks for these figures - I did get 72.6mpg on a 6 mile run after resetting trip. However it normally is still 48 - 51 overall.

Will have to keep trying.............................

[daylight1]

I've had my IS 300h Luxury since mid March and done 5,300 miles - private buyer, not Company car but use it for company business so my annual mileage can be anything from 12,000 to 17,000 a year. I wanted to see if there was any significant difference in fuel economy between the three modes; Eco, Normal and Sport. Figures for the first three tanks of fuel were 43, 43 and 46 respectively, which I found a little disappointing given the combined figure in the brochure is 64.2 :-( I know the manufacturers figures are never likely to be achieved by anyone in practice, but a difference of 33% is a lot.

I measured my fuel consumption by starting with a full tank then used the miles done and the actual amount of fuel to re-fill the tank rather than use the car's mpg display. I'd read that as the hybrid system "beds in" and the driver gets used to the different driving style, (accelerate quickly then back off and let EV mode cut in), the fuel consumption would improve. The next three tanks of fuel produced figures of 49, 50 and 45 respectively so the theory seems to be right in practice.

My daily commute is only 20 miles each way, part rural and part town with some hill work and only one short part with a 60mph speed limit. I've therefore been happy enough to run on the Eco setting, which I don't find that much slower than the sport setting to be honest. This is now giving me an average of 53, which I'm pretty pleased with. The car's display is currently reading 54.7 so a little bit out but I'm not that fussed because I find the ultra smooth and quiet drive to be very relaxing.

I'd been driving IS 250's for the previous 8 years and could only get 29mpg on average so the current economy, plus the road tax benefit is going to save me between £1,500 and £1,900 a year which I'm very pleased with. When I factor in the slightly lower maintenance costs the savings could be over £2,000.

I wouldn't hesitate to recommend a Lexus hybrid to other drivers based on my experience to date.

Robert

[DJP]

I haven't been as scientific as you but certainly echo your final point. Highly recommended from me.

Sent from my Iphone using Lexus OC

[Bob99]

Agree with is250 comparison daylight1 but looking at other posts servicing seems to be more expensive with quotes of £450 ish for 20k. Thought there was less maintenance on hybrids. Seemed a lot less on my is250.

[Ian J. Parsley]

I do wonder if there is a weather difference?

In the winter I was consistently 46-48mpg. In the last few months I've been consistently around 51mpg, however. I'm not sure I'm doing much differently now as then. Fairly mixed; few long journeys (almost never more than 40 minutes).

[dochybrid]

Hi Ian

That's interesting-I guess warm weather could make a difference...

have been getting 49-50 with motorway and city combined..

I have also noticed that the car seems to does better mpg on motorway driving as compared to the city as I consistently notice change in mpgs within the city..

In contrast to prius 3rd generation I had, which used to do really good in the city and less efficient on motorway..

[lexicon]

Definitely better mpg during warmer weather for a number of reasons.

Engine takes longer to reach operating temperature and you're likely to run the heater, lights and wipers more in winter which will result in more load/engine running.

Cold air is more dense and will need more fuel to maintain the correct mixture.

There's other factors like in winter it's more likely to be wet which will increase rolling resistance.

All these little things add up.

[ColinBarber]

the hybrid Battery also has a reduced usable capacity in cold temperatures meaning the petrol engine is used more.

[UnSean]

Definitely better mpg during warmer weather for a number of reasons.

Engine takes longer to reach operating temperature and you're likely to run the heater, lights and wipers more in winter which will result in more load/engine running.

Cold air is more dense and will need more fuel to maintain the correct mixture.

There's other factors like in winter it's more likely to be wet which will increase rolling resistance.

All these little things add up.

Forums are great if the info posted is correct, but Martin I am not sure where you get yours from but you could not be more wrong

Cold air improves the engines power output for a given throttle opening, it therefore improves efficiency in cold weather.

Secondly wet surfaces unless it's glue or tar etc give reduced grip and therefore reduced rolling resistance

And return better mpg, this further improves mpg as most tend to drive slower due to reduced grip.

[tinka]

I think the only difference in colder weather, is cold starting and the engine requiring more fuel in the warm up phase, which obviously takes a bit longer, much like the old chokes, modern engines still use more fuel on cold starts, I assume?.

[lexicon]

Cold air improves the engines power output for a given throttle opening, it therefore improves efficiency in cold weather.

Secondly wet surfaces unless it's glue or tar etc give reduced grip and therefore reduced rolling resistance

The reason you get more power in cold weather is because the fuel/air mixture is denser, you still have to put more fuel into that mixture.

When the tyres throw up spray, that's energy being wasted moving the water.

Whatever the reasons, every car on which I've bothered to measure the fuel consumption gets worse mileage in the winter.

[ColinBarber]

Cold air is more dense and will need more fuel to maintain the correct mixture.

There's other factors like in winter it's more likely to be wet which will increase rolling resistance.

All these little things add up.

You are both correct. Whilst you ultimately get more power in colder weather due to denser air (which essentially is like increasing the engine compression ratio ever so slightly) the engine has to maintain the correct air/fuel ratio and therefore more puts in more fuel.

But just because there is more power doesn't mean it has to be used. To achieve the same result (e.g. maintain a constant speed along a road), in colder weather the driver would have the throttle closed slightly which would reduce the amount of air to be the same as in warmer weather and the ECU would fuel the same to achieve the programmed air/fuel ratio.

The net result is you shouldn't really see any difference in mpg just from the air temperature. A minor difference would be the denser air has a negative effect at high speed - the wind/air resistance would be higher.

On a damp road on slicks you may get a reduced rolling resistance but any meaningful amount of water on the road with treaded tyres will increase fuel consumption as energy is used to pick up and throw the water.