My Best Mpg Yet!

[wastedagen]

Been doing a lot of motorway driving recently and this has given me my best MPG to date. Approx 65.45mpg. Did 664 miles and put in 46.12L of derv.

I could have got 710+ miles out my tank if I kept going till it run dry. In fact the further I was driving on the motorway the more the range indicator was slowing down given me more possible miles.

The warning light still hadn't come on either.

Driving conditions:

* 98% Motorway. 60% of that through 50mph average speed camera roadworks.

* No faster than 60mph.

* Using Cruise Control whenever possible.

* No Air Con, Just heater.

* Nothing in the boot, except my locking wheel nuts.

* Only me driving.

* Tyres all at 40psi.

* I do have a tuning box giving me an extra 25bhp and 6mpg.

So from this info you can probably say it was the perfect driving conditions. But it proves that the Auris Diesel engine can and does produce excellent mpg.

[AURISTR01]

Interesting but what does your Average MPG indicator display read?

Dont run a diesel so low because you may have starting problems if Air gets into the system.

[wastedagen]

Sorry but I don't believe the average MPG indicator to be as accurate as basic maths. I topped up to the exact same level, I.e. where I could touch the fuel. This gave me the 46.12l which is 10.145 gallons. Miles divided gallons gives mpg. Now I'm not trying to insult you or teach you to suck eggs my friend but how can you get any more accurate than that. Unless I'm missing something.

[AURISTR01]

Im not disputing your claim, I was only asking what does your average MPG trip display, but if you dont wish to share thats kool, you dont need to start laying eggs over it B)

Many on here have stated the average MPG disply is near enough spot on.

[wastedagen]

ok no probs. Next time I'm in the car ill see what it says......

Edit: just had a quick look at it says 57.7mpg

Not particularly close. Reason why I never use it.

[AURISTR01]

ok no probs. Next time I'm in the car ill see what it says......

Edit: just had a quick look at it says 57.7mpg

57.7 MPG is worth shouting out about!!!

Is there anything in particular your car has what many of ours dosen't

[wastedagen]

oh yeah one thing I did forget to add to my list, which Ive done now, is state I have a tuning box added. This has given me an extra 6+mpg. And since I have had it installed for nearly 2 years now I think its starting to pay for itself.

[Daveyonthemove]

Thats great mileage from a full tank, and credit to you for having such patience. I'm struggling to hit any higher than 51mpg on a single journey, but i have the 2.2 engine which is strangled by the DPF, but i seem to be getting better MPG than most other T180/SR180 owners do and the only variation i can think of is my tuning box... Must be helping.

[T Sport 1978]

Nice

Good to see a positive post for frigging once.

[sponge55]

oh yeah one thing I did forget to add to my list, which Ive done now, is state I have a tuning box added. This has given me an extra 6+mpg. And since I have had it installed for nearly 2 years now I think its starting to pay for itself.

which tuning chip are you using??

[wastedagen]

oh yeah one thing I did forget to add to my list, which Ive done now, is state I have a tuning box added. This has given me an extra 6+mpg. And since I have had it installed for nearly 2 years now I think its starting to pay for itself.

which tuning chip are you using??

No branded one. Just an eBay special.

http://www.toyotaownersclub.com/forums/index.php?showtopic=88781&st=30&p=858841entry858841

[Cyker]

664 miles on a tank is very good; I get roughly 500-600 miles on my teensy Yaris with a mix of mostly town driving with the odd motorway run.

I reckon could get 800-900 out of it with mostly motorway driving tho' :D

[Crasstoe]

I normally get around 500 miles to a tank, 600+ on the motorway, but I couldn't sit at 60 on the motorway :( I wish I had your patience

[Cyker]

It's easy in my diesel Yaris because going any faster on normal diesel makes the engine sound and feel really ****ing scary

(It's amazing how much less vibration there is with higher cetane diesels like V-Power! )

[deej78]

Just a message for everyone reading this. 40 psi can have very adverse effects to the stopping ability of your vehicle, will wear down quicker and void your insurance in the event of a serious accident. It also makes your car really loud and creaky over time, and adds years to your dampers. Finally, over inflating tires as no effect on how many miles you car will do, however, under inflated tires will. Its your call. http://www.popularmechanics.com/cars/news/4199963 http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=1

[bruce e]

Just a message for everyone reading this. 40 psi can have very adverse effects to the stopping ability of your vehicle, will wear down quicker and void your insurance in the event of a serious accident. It also makes your car really loud and creaky over time, and adds years to your dampers. Finally, over inflating tires as no effect on how many miles you car will do, however, under inflated tires will. Its your call. http://www.popularmechanics.com/cars/news/4199963 http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=1

I've never understood this fad of overinflating tyres to improve mfg & therefore reduce running cost. (Along with underinflating in winter to improve grip!) What about the added cost due to the centre tread of tyres wearing out & having to repalce tyres earlier than normal?

Yes, one of the tasks carried out by police at the scene of any major traffic accident is to check the tyre pressures of the cars involved. Why? Incorrect pressures adversely effects the handling of concerned!

[Cyker]

We do it because it works!

More PSI = harder tyre = less rolling resistance and longer sidewall life.

Downsides are a harder ride, increased road noise.

Obviously you have to be sensible about it; Inflating the tyres to like, 60psi would be ridiculous and definitely dangerous.

However, small increases, e.g. 32 to 35, or even 40, will not cause the centre tread to wear out noticeably faster, but will let you coast (in gear!) for longer; A technique I (ab)use a lot to keep my mpg from tanking completely in heavy traffic :)

As a side bonus, I've found it helps prevent the tyre edges wearing out as fast as more of the load will be spread over the tyre rather than concentrated on the shoulders.

I have been doing a bit of testing on mine; On my old tyres 38-40psi for the front and 35 on the back gave good feel and noticeably longer coasting without any noticeable change in grip (If anything grip and handling feel were better, esp at speed!).

The only real downside I'd noticed was there was more understeer in the wet, but I am now thinking that was down to the tyres hitting that critical 3mm tread depth; On the new tyres I have (Conti EcoContact3's; Really nice tyres!), the grip has been nice and predictable in both wet and dry.

Am running them at 35f/32b rather than 40/35 tho' as trying a few psi higher seems to make much less difference on the harder compound.

Also, to put things in perspective: I was reading the handbook of my dad's Ford Focus 1.9 TDCI; It says if you have a full load (5 people + luggage) and will be driving at 100mph, the tyre pressures should be 35F/46B!!!!! :lol2:

At the end of the day, this is in the same category as using fuel additives or ECU chips; It won't be for everyone...!

[Adam C]

Must admit I'm with Cyker on this one.

For sure there's overinflation and then there's inflating them a little higher than the minimum in the car's handbook, but in my case a bit below the maximum permitted (desired 35f/34r, min 33f/32r in my car's case). I also confess to the little occurrences of coasting in traffic situations but only where I deem it to be safe to do so; the clutch pedal is ready to be brought up with the most appropriately selected gear should I need to pull up suddenly.

A little off-topic with the sub-topic tyres but sussing out the traffic light routines (when they're gonna change & how long you're held on red) helps your mpg too by enabling fuel saving by switching the engine off (may be different with a D-4D after a long run and hot turbo).

Despite that I still get most wear on the outer edges of the tyres. Yeah they're noisy but I believe that could partly be due to the brand (mine's also running Continentals, came with ContiPremiumContact 2s as standard, replaced fronts like-for-like as I want to keep it standard plus these tyres have phenominal grip). Previous Yaris was bought used with WANLI fronts and Dunlop rears; I believe it was quieter but not as much grip. Can't say much about the fuel economy on them as I had a habit of idling the car for a minute or two before I drove it plus I wasn't quite as light-footed as I am now with this one. Wouldn't recommend running WANLIs though; less grip will obvously mean less stopping power, whatever the pressure

[Daveyonthemove]

Actually, thats incorrect.

Coasting is using more fuel than just allowing your car to slow down in gear, so you are contradicting yourself by over inflating the tyres to save fuel, then coasting along and burning more of it.

[bruce e]

Must admit I'm with Cyker on this one.

For sure there's overinflation and then there's inflating them a little higher than the minimum in the car's handbook, but in my case a bit below the maximum permitted (desired 35f/34r, min 33f/32r in my car's case). I also confess to the little occurrences of coasting in traffic situations but only where I deem it to be safe to do so; the clutch pedal is ready to be brought up with the most appropriately selected gear should I need to pull up suddenly.

A little off-topic with the sub-topic tyres but sussing out the traffic light routines (when they're gonna change & how long you're held on red) helps your mpg too by enabling fuel saving by switching the engine off (may be different with a D-4D after a long run and hot turbo).

Despite that I still get most wear on the outer edges of the tyres. Yeah they're noisy but I believe that could partly be due to the brand (mine's also running Continentals, came with ContiPremiumContact 2s as standard, replaced fronts like-for-like as I want to keep it standard plus these tyres have phenominal grip). Previous Yaris was bought used with WANLI fronts and Dunlop rears; I believe it was quieter but not as much grip. Can't say much about the fuel economy on them as I had a habit of idling the car for a minute or two before I drove it plus I wasn't quite as light-footed as I am now with this one. Wouldn't recommend running WANLIs though; less grip will obvously mean less stopping power, whatever the pressure

How about coasting on the M'way on long downhill stretches, Think of the fuel to be saved

Mind end in tears though

Sorry, couldn't resist it! :!Removed!:

[Cyker]

Depends whether they are coasting in neutral or in-gear.

Coasting in neutral is pointless as it doesn't save fuel (It's even worse if you're coasting with the clutch in as you'll be wearing away at the release bearing and diaphragm spring!), but coasting in-gear is ossom and is something everyone should do :D

I generally don't recommend turning off the engine at the lights; In really bad traffic jams or level crossings it's worth it, but at every light change is a bit excessive and you run the risk of shortening the Battery life and toasting the starter motor.

Stop-start cars are built for it, with higher spec batteries and a better starter, but regular cars aren't...

[Adam C]

To be honest, I'm not sure how coasting would use more fuel than slowing down in gear - surely the engine still injects the same amount of fuel in with both situations or does it inject less? Does it cut fuel further under braking? Surely on the slight downhill sections where you don't need to brake, you'd need a little gas when its in gear but if you coast, you maintain the same speed?

One may have to test this . .

Tempting bruce e! Though no doubt that would then result in extra brake wear . .

[Adam C]

I see your point there Cyker. The junctions I turn the engine off hold you on red horrendously long (definitely more than two minutes at best of times, much longer in rush hour).

[Daveyonthemove]

To be honest, I'm not sure how coasting would use more fuel than slowing down in gear - surely the engine still injects the same amount of fuel in with both situations or does it inject less? Does it cut fuel further under braking? Surely on the slight downhill sections where you don't need to brake, you'd need a little gas when its in gear but if you coast, you maintain the same speed?

One may have to test this . .

Tempting bruce e! Though no doubt that would then result in extra brake wear . .

http://www.theaa.com/motoring_advice/fuels-and-environment/drive-smart.html

[Adam C]

That's me standing corrected Daveyonthemove, I was always thinking the ECUs wouldn't cut the fuel going into the engine when you lift off in gear. How wrong I am . .