Hi all,

I did another run to Oxford yesterday and the car managed 93.7mpg average over the return trip of 242miles. The 121 miles up there was from a cold start and likewise the return drive.

There were plenty of convenient hgvs on the route but it took a while to find an up laden one that did not slow to a crawl on the hills.

On the return trip, just as I was leaving the a34, the return drive trip computer (#1 av mpg) showed 99.2mpg but the a27 and chichester hammered that down to 94mpg on shutdown.

I am edging closer to 100mpg and perhaps the Gucci diesel and summer temps will get me there...

These figures are all indicated but a brim test I did showed about 1.5% accuracy. Cruise control off and tyres at 44psi. Did not even charge the phone!

Anyone else trying for 100mpg? That Austrian chap did 127mpg...god knows how although I have heard 55psi!

Regards,

Ed

Excuse my ignorance, but won't pumping up the tyres to that sort of pressure cause uneven tyre wear? 94mpg is incredible though!

I was inclined to agree with you but so far the wear is pretty even. The downsides are poorer ride and less surface area therefore longer stopping distance but I leave loads of distance from the vehicle in front so happy to live with that...

Holy moly. That's one helluva result. Personally I'm on a quest to average 70mpg in my 1.6 diesel. 100mpg is like science fiction to me!

I like Hypermiling,

 but over inflating tyres is just plain daft, and dangerous..

 

& from your post you clearly understand the principle and downside of lack of handling, stopping distances, control in the wet or cold etc.

Anything that comes your way after an accident or an incident were you can not stop and your car is inspected will be well deserved IMO, since you are running a car like that on purpose, to save a few £.

 

Do you set these tyres as a Cold set pressure?

 

Maybe after a long drive or on a hot day re-check the pressures and see what they are then sitting at.

I have had 88mpg on one run and 93.4mpg on another kent to Birmingham, (m20, m25, m40)

 

can do kent to brum and back and the gauge just ticks down onto half

 

good fun to play the game of how much can I get, I too am going to try for the 100+ mpg

 

I don't take the tyres over normal pressures though

Edited 11 March, 201412 yr by bluecar1

Thats insane. Didnt think any fabia would be capable of that.

I'm not sure id be happy with increasing the pressures to an extent that causes stopping distances to be vastly increased.

Then again i dont potter along behind lorries at 56mph. So its perhaps not as bad Haha.

I'm just happy with leaving everything standard and still getting twice what my old Civic used to return!

 

My last fill up - 560(ish) miles over 3 days on the M4, 5:30am starts (so heater and lights), ranging 60/70mph on the journey (think my Sat-Nav said 64mph average), gave me 68.6mpg (recorded using Fuelly - see my sig) which is a mahoosive saving! 

There were plenty of convenient hgvs on the route but it took a while to find an up laden one that did not slow to a crawl on the hills.

 

 

 

The downsides are poorer ride and less surface area therefore longer stopping distance but I leave loads of distance from the vehicle in front so happy to live with that...

 

I detect a paradox here.   You claim to be leaving extra distance to account for extra stopping distance but you are still tucking in behind HGV's close enough to get an aero-tow?

Hmmm....

 

You can take hyper-miling too far!

 

Maybe you should try this to get even better mpg

http://www.vehiclerecovery.org/history/images/horse.jpg

If you're driving that slow just to get close to 100 mpg then wouldn't you be better off going electric a it can't be much fun driving like that.

Sent from RAZRi using Tapatalk

There are a number of hypermiling forums that discuss tyre pressures and a few chaps mention 55psi! They also go on to say they are happy to put up with the odd blow out through Death Valley....some of these guys also tuck up within the suction zone of big wagons...and then turn the engine off! That is a little hardcore.

This sort of driving requires a lot of concentration as after six hours total on the road, I'm pretty tired but careful throttle use, limited brake use and considered use other road users is a considered risk.

Hgv drivers have the best view of the road ahead, have zero interest in reducing speed and every intention of maintaining momentum. As long as they are not watching porn or entertaining a lady in the cab, I feel, at 0500, on an empty road, a reasonable distance behind is acceptable...I am not suggesting sitting right in the suction zone. They take most of my form drag which increases exponentially with speed. I can therefore travel at 56 mph for the fuel burn of about 45-50mph.

Each to their own with these 'risks' but I spend my working life pottering around at 400+ knots so 56mph and maximum cash saved is the way for me. The difference in arrival time over my run to work between cruising sedately and hammering along at 80mph equates to about 5 minutes yet £400+ a year. I'd rather get up earlier and spend the saving on something worthwhile.

Good luck to those having a crack at three figures...it has to be possible..

Kind regards,

Ed

As an aside, I'm reasonably sure the max design pressure on the dunlops is about 50psi, so I am within that and generally, engineering allows for a fair few percent of tolerance...or at least I hope it does!

Whether or not the lorry driver infront can see or not. I certainly wouldn't be trusting him with mine (and passengers) life.

We all have momentary lapses in concentration. Truck drivers are no different.

In fact, hes probably getting annoyed with the little 1.2tdi's that keep sittin up his lorries chuff.

Do lorries do the brake test method too? .

I prefer to keep a distance back. You can see more, more time to react, more time to execute an overtake if needs be, more time to dodge pot holes etc etc.

I cant imagine looking at a lorries numberplate super close up at nearly 60mph. I think id get abit scared haha.

Max pressure given on on a Tyre Sidewall is the Max for that tyre in different applications on different vehicles.

 

Your vehicle manufacturer has given the suggested Tyre Pressures Range for the weights of your actual type of vehicle with the tyres/size they fit, and you need to be aware of Temperature when setting and running tyres

at different pressures,

Vehicles loaded and unloaded Gross weights.

(but someone used to pottering about at 400+ knots will have a knowledge of tyres and pressures when landing,

if they are a pilot. well we hope so!)

 

I find Hypermiling easier and safer behind a Box Van doing a decent speed.

Not on  Motorways, but in NSL areas or where there are Average Speed Cameras,

& no other traffic mostly, over fair distances.

& not right up his jacksy,

right back in the tow, where you can lift right off the throttle and the car gets the tow,

you see and feel the spot quite easily..

(Thats the Eddie Area like on a river in a Canoe or Kayak,) 

and you are clearly in his mirrors and you see the vehicle in fronts mirrors, 

and at a safe distance.

"right back in the tow, where you can lift right off the throttle and the car gets the tow,

you see and feel the spot quite easily..

(Thats the Eddie Area like on a river in a Canoe or Kayak,)

and you are clearly in his mirrors and you see the vehicle in fronts mirrors,

and at a safe distance."

Spot on although I view the risk as lower on the motorway as I feel there are fewer threats and all round visibility is greater.

North of Perth in Scotland there are no Motorways.  So its often a Location Location Location thing.

 

Sadly heading south is not all downhill,

actually i notice how much you are climbing when heading from Perth towards Glasgow.

I use more fuel going south compared to when heading back North, and not just due to the prevailing wind.

Maybe its me then? I could never imagine driving a NSL road without reading the road for myself. I dont put trust in anybodys driving.

Maybe thats come from the motorbike side of things. Who knows.