Prado mpg on a long run.

wobbly

Well-Known Member
Nov 27, 2010
2,639
92
48
Gods own Somerset, home of Alfred the Great!
Garage
Up to Manchester and back for family duties, almost all motorway, no hold-ups (at all, not one !!)

33mpg.

Thats at a steady 60mph, which, surprisingly, saw me in the middle lane most of the time on the way there, on the way back there were far less hgvs and vans.

The time was within 2 minutes of the gps estimate :think:

Now bearing in mind the motorways are 70mph, and I was doing 60, I dont understand its maths, as I should have tken longe than it first estimated.

Truck ran luvverly, only small hiccup was a plastic window shield coming off, due to the excessive mph (I normally poodle at about 50mph) but I managed to stop in time and saved it for reaffixing.

Went to an area called Cheetham Hill, an interesting and exotic location, surprised it isnt mor epopular as a holiday destination.

Pete
 

Graham

Well-Known Member
I am in uk
Mar 22, 2010
3,907
121
63
Warrington, Cheshire
Garage
33 is good.
Don't think I have hit 33, as I have had the slightly oversize tyres on, almost since I bought her, over 6 years ago.

Nothing much wrong with it, by returning good figures like that.

Gra
 

tim falce

Member
Oct 22, 2011
133
3
18
I seem to get a lower fuel consumption if I keep mine about an indicated 75mph, sat nav speed of about 65-68mph. This is at about 2800revs where it just seems to come on cam.
 
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wobbly

Well-Known Member
Nov 27, 2010
2,639
92
48
Gods own Somerset, home of Alfred the Great!
Garage
Its a 3.0td auto, running 33" tyres. Revs were around the 2000 +/- 200

Generally I get about 24mpg mixed, but I reckon the long run at low speed with no stop/start is the key to the better mpg.

For accuracy, I brimmed the tank, zeroed the mileage, did the journey, brimmed the tank again and then worked out exact gallons used.

Tim - I cant remember the last time I drove at 75mph......I am genuinely slow and steady, but mainly slow.

Pete
 

NeilJ

New Member
Jan 6, 2012
5
2
3
Please seer my sad fuel log for last year. Best average for a tank was 27mpg towing a small camping trailer so getting 33mpg is possible.
Below figures are for a sw90 auto 1996.
DateKmsMilesQty LitresQty GalMiles/litreMiles/gallTotal £Cost/litreCost/gallCost/mile
09-Jan-13617383.473.2816.113.5423.80£103.251.416.410.27383
19-Jan-13562349.267.6514.873.2723.49£96.671.436.500.28733
02-Feb-13564350.570.1615.423.3922.73£100.261.436.500.291083
11-Feb-13524325.661.4813.512.9724.10£88.471.446.550.271409
24-Feb-13601373.473.0916.063.5323.25£105.911.456.590.28esso1782
12-Mar-13625388.477.0116.933.7222.95£112.361.466.640.29total2170
28-Mar-13645400.876.1516.743.6823.95£110.341.456.590.28total2571
07-Apr-13559347.368.5415.063.3123.06£100.001.466.640.292919
18-Apr-13656407.674.1916.313.5825.00£106.761.446.550.263326
30-Apr-13615382.170.8315.573.4224.55£99.801.416.410.26total3708
13-May-13671416.973.1616.083.5325.93£103.081.416.410.25Shell4125
24-May-13672417.675.3716.563.6425.21£103.941.386.270.25bp4543
07-Jun-13603374.770.7615.553.4224.09£98.991.406.370.26shell4918
18-Jun-13677420.770.715.543.4227.07£98.911.406.370.24shell5338
28-Jun-13551342.457.2312.582.7627.22£79.491.396.320.23shell5681
03-Jul-13577358.566.0814.523.1924.69£98.391.496.770.27esso6039
12-Jul-13610379.070.6615.533.4124.41£98.851.406.370.26shell6418
23-Jul-13606376.664.6214.203.1226.51£91.701.426.460.24Shell6795
01-Aug-13631392.171.9115.803.4724.81£102.041.426.460.26Shell7187
12-Aug-13706438.773.7816.223.5627.05£105.431.436.500.24Shell7625
22-Aug-13668415.172.5415.943.5026.04£103.661.436.500.25shell8041
03-Sep-13582361.670.515.493.4123.34£100.041.426.460.28esso8402
13-Sep-13672417.673.1916.093.5425.96£104.591.436.500.25esso8820
21-Sep-13561348.664.7514.233.1324.50£91.881.426.460.26esso9168
29-Sep-13639397.165.6514.433.1727.52£98.871.516.850.25Sainsburys9565
05-Oct-13564350.563.413.933.0625.15£87.431.386.270.25shell9916
14-Oct-13633393.370.4715.493.4025.40£99.291.416.410.25shell10309
24-Oct-13621385.970.415.473.4024.94£99.191.416.410.26shell10695
31-Oct-13535332.462.6813.783.0324.13£85.181.366.180.26Sainsburys11027
08-Nov-13631392.167.614.863.2726.39£93.901.396.320.24shell11420
14-Nov-13475295.263.9314.053.0921.01£89.441.406.370.30Shell11715
23-Nov-13586364.169.815.343.3723.74£94.161.356.140.26esso12079
04-Dec-13635394.672.2515.883.4924.85£98.191.366.180.25esso12473
13-Dec-13590366.665.5114.403.1625.46£92.301.416.410.25shell12840
20-Dec-13525326.260.1213.212.9024.69£82.301.376.230.25esso13166
24-Dec-13569353.664.6814.223.1224.87£90.491.406.370.26Texaco13520
31-Dec-13588365.473.9716.263.5722.47£100.531.366.180.28esso13885
Ttl KmTtl milesTtl LTtl GAv m/lAvg m/galTtl CostAvgAv/galCost/Mile
2234613885.22558.09562.223.3424.71£3,616.081.416.430.26
 

McLean Racing

Active Member
I am in uk
Jan 8, 2014
55
4
18
Ive only had my LC90 Colorado just under a month, but i did the same, i brimmed it when i bought it, and i filled it up again last nite (payday). Most of my driving is 50mph roads but i also do some around town driving at weekends, but i returned a combined fuel consumption of 25.7mpg which i was quite pleased about as i thought it would be alot less than that with it being such a big truck. My average on my old car (lexus is200se petrol) was between 28-32mpg combined so realy, these LC's aint too bad i dont think
 

tim falce

Member
Oct 22, 2011
133
3
18
Its a 3.0td auto, running 33" tyres. Revs were around the 2000 +/- 200

Generally I get about 24mpg mixed, but I reckon the long run at low speed with no stop/start is the key to the better mpg.

For accuracy, I brimmed the tank, zeroed the mileage, did the journey, brimmed the tank again and then worked out exact gallons used.

Tim - I cant remember the last time I drove at 75mph......I am genuinely slow and steady, but mainly slow.

Pete
That's an indicated 75mph, my speedo is nearly 11% out, the original tyres were 215-80X16, now very slightly smaller 225-75s. I find It'll change into top at a lower speed now which helps. I was going to put larger tyres on but my wheels are only 6j with not much offset, car is a Colorado FX auto and I do a lot of towing with it so want the power rather than speed.
 

Shayne

Well-Known Member
Supporter
Guru
Feb 2, 2013
13,227
4,926
113
South Wales UK
Speed has little to do with consumption i reckon , at tickover revs your running at your most efficient and what gear your in or what speed you are traveling at really doesn't matter . Motorways give better mpg because you aren't stopping and starting (unless you use the M6) and accelerating through the gears . Tickover speed in top gear might differ about 20mph while comparing almost identical trucks if one has 31" tyres and the other 33" .
 

Doodle

Well-Known Member
Aug 20, 2012
939
1
38
Echo Beach
Garage
Each vehicle will have it's own sweet spot for economy. It's a balancing act between engine speed, gearing, transmission losses and aerodynamic drag. There's some serious number crunching involved.

Look up "brake specific fuel consumption". But don't blame me if your brain starts leaking out of your ears :laughing-rolling:

20mph is a little ambitious, Shayne. Assuming 60mph on 31s, the same setup on 33s would be approx 4mph faster.
 

Graham

Well-Known Member
I am in uk
Mar 22, 2010
3,907
121
63
Warrington, Cheshire
Garage
When I drove mine home from Andy Cook in Aberdeen it was 460 odd miles and I got 22 and a tad running 265/75/16 tyres, not got a clue if this is good or bad
.
Must have been more than 22.
I would double check them there figures.

On a good run of that distance, I would have expected at least "high twenties" maybe even a 30 mpg.

Gra.

Gra
 

Doodle

Well-Known Member
Aug 20, 2012
939
1
38
Echo Beach
Garage
Depends on how long those miles took. The KZ-engined 90s can get rather thirsty if you start pushing them.
 

Graham

Well-Known Member
I am in uk
Mar 22, 2010
3,907
121
63
Warrington, Cheshire
Garage
Speed has little to do with consumption i reckon , at tickover revs your running at your most efficient and what gear your in or what speed you are traveling at really doesn't matter . Motorways give better mpg because you aren't stopping and starting (unless you use the M6) and accelerating through the gears . Tickover speed in top gear might differ about 20mph while comparing almost identical trucks if one has 31" tyres and the other 33" .
.
.
I feel I have to disagree.
Speed after say 45 mph, does increase fuel consumption
I say that, because at 41 mph, the overdrive kicks in, and revs take a substantial drop.

If I was able to drive 45 mph, constant, I believe that would give very good fuel figures.
The windage just gives our trucks a poor figure, as they are not particularly aerodynamic, now are they.

However, it is just impracticable to drive hour after hour at just 45 mph, and this is why I strongly feel that around 50mph to 55 mph is the efficient speed for these trucks.

At 55 mph I think my engine is turning over at around 1600 rpm, which also happens to be the start of the torque band.

Gra
 

Beau

Well-Known Member
I am in guyana
Jan 28, 2011
2,001
290
83
Milton keynes
Each vehicle will have it's own sweet spot for economy. It's a balancing act between engine speed, gearing, transmission losses and aerodynamic drag. There's some serious number crunching involved.

Look up "brake specific fuel consumption". But don't blame me if your brain starts leaking out of your ears :laughing-rolling:

20mph is a little ambitious, Shayne. Assuming 60mph on 31s, the same setup on 33s would be approx 4mph faster.
Agree with you hear! I find just as it ticks into top gear (around 60mph) it can labour the engine a bit, especially when going up a slight hill and so you need to push on a little more. I think at 70mph she cruises easily, but even so I find at 80mph she can sit there all day happily. MPG difference from 60mph to 80mph is pretty much the same, it's when you're pushing 100mph that your fuel economy suffers. I don't often calculate MPG but I get a good 400-450 miles from a brimmed tank to when the reserve light starts flickering on motorway runs.
 

Richard Jackaman

Well-Known Member
Apr 6, 2010
246
2
38
Scottish Borders
The drag on a vehicle increases proportionally to the square of the speed. Therefor the drag at 80mph is almost twice that at 60 (6400 v 3600), irrespective of the shape of the vehicle. As has been said before, it may be that a vehicle is more efficient at a given speed due to gearing or rpm etc which offsets the increase in drag.




Sent from my iPad using Tapatalk
 

Shayne

Well-Known Member
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Guru
Feb 2, 2013
13,227
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South Wales UK
I've got around a 300 mile drive ahead of me tomorrow so should be able to report back with sadly shocking mpg figures with 285/75 coopers , intercooler , 3" exhaust , fuel pump turned up , turbo boosting at god only knows what psi and a K&N filter , besides which i always have the window open which is not gonna help with drag at 70+
 
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