Fuel consumption

Other technical Issues with the Triumph 2000 range
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Roymck
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Fuel consumption

#1 Post by Roymck » Tue Aug 21, 2018 8:53 pm

Is there a lot of difference in fuel consumption between a 2000 and a 2.5 pi. What would you expect mpg on a 2.5 pi.

johnnydog
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Re: Fuel consumption

#2 Post by johnnydog » Wed Aug 22, 2018 11:04 am

A correctly set up PI can be more economical than one running on carburettors. However, unless you are proficient in setting up a PI, invariably they can be more thirsty. It possibly also doesn't help as the nature of the beast (a PI) probably encourages you drive more spiritedly!
I used to get top 20's from a PI many years ago when on a run, but when they are out of tune, it can be as low as early teens!
It makes sense with a PI to esnsure that it is properly set up - even if you are paying for someone else to do it as long as they know what they are doing, it will be cost efficient in the long run.
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1967 Mk1 2000 in Gunmetal Grey
1969 Mk1 2000 in Royal Blue
1970 Mk2 2000 in Valencia Blue
1972 Mk2 2.5 PI in Triumph White
1973 Mk2 2.5 PI in Sienna Brown
1976 Mk2 2500S in Carmine Red

M5driver
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Re: Fuel consumption

#3 Post by M5driver » Fri Aug 24, 2018 11:48 am

Hi having owned several 2.5pi's saloons and estates it does depend on your right foot. But on a long run cross country 26/27 mpg, motorway you can get 30 keeping to the speed limits. Around town in a cold winter on a short journey (unlikely these days) 17/18 mpg. Towing expect very low 20's even less if hilly.
A 2000 will have to work harder if used to the limit hence using more fuel. My first 2000 never did more than 20/22 mpg. There was no overdrive on the car. That's another thing to consider a man/od car will use less fuel than auto.
Hope this helps. Importantly the pi must be correctly set up and the engine in good order with a idle vacuum of 14 to 16 Hg or thereabouts.
Chris Lennard Mem 1906
Triumph 2.5pi MK1 1969 Damson, tan interior
TRiumph 2.5pi MKII 1972 Mallard, black interior
BMW E34 M5 LE 47/50 Orinoco Green
VW Golf mk6 Bluemotion Black

M5driver
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Re: Fuel consumption

#4 Post by M5driver » Fri Aug 24, 2018 11:48 am

Hi having owned several 2.5pi's saloons and estates it does depend on your right foot. But on a long run cross country 26/27 mpg, motorway you can get 30 keeping to the speed limits. Around town in a cold winter on a short journey (unlikely these days) 17/18 mpg. Towing expect very low 20's even less if hilly.
A 2000 will have to work harder if used to the limit hence using more fuel. My first 2000 never did more than 20/22 mpg. There was no overdrive on the car. That's another thing to consider a man/od car will use less fuel than auto.
Hope this helps. Importantly the pi must be correctly set up and the engine in good order with a idle vacuum of 14 to 16 Hg or thereabouts.
Chris Lennard Mem 1906
Triumph 2.5pi MK1 1969 Damson, tan interior
TRiumph 2.5pi MKII 1972 Mallard, black interior
BMW E34 M5 LE 47/50 Orinoco Green
VW Golf mk6 Bluemotion Black

M5driver
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Re: Fuel consumption

#5 Post by M5driver » Fri Aug 24, 2018 11:49 am

Hi having owned several 2.5pi's saloons and estates it does depend on your right foot. But on a long run cross country 26/27 mpg, motorway you can get 30 keeping to the speed limits. Around town in a cold winter on a short journey (unlikely these days) 17/18 mpg. Towing expect very low 20's even less if hilly.
A 2000 will have to work harder if used to the limit hence using more fuel. My first 2000 never did more than 20/22 mpg. There was no overdrive on the car. That's another thing to consider a man/od car will use less fuel than auto.
Hope this helps. Importantly the pi must be correctly set up and the engine in good order with a idle vacuum of 14 to 16 Hg or thereabouts.
Chris Lennard Mem 1906
Triumph 2.5pi MK1 1969 Damson, tan interior
TRiumph 2.5pi MKII 1972 Mallard, black interior
BMW E34 M5 LE 47/50 Orinoco Green
VW Golf mk6 Bluemotion Black

johnnydog
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Re: Fuel consumption

#6 Post by johnnydog » Fri Aug 24, 2018 4:42 pm

Have you got a twitchy finger Chris? :lol:
Register Member no. 1596

1967 Mk1 2000 in Gunmetal Grey
1969 Mk1 2000 in Royal Blue
1970 Mk2 2000 in Valencia Blue
1972 Mk2 2.5 PI in Triumph White
1973 Mk2 2.5 PI in Sienna Brown
1976 Mk2 2500S in Carmine Red

Peter Douglas W
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Re: Fuel consumption

#7 Post by Peter Douglas W » Sat Mar 02, 2019 3:18 pm

I had no problems in gettingh 30 + Important is not the PI bits it is everthing else. Good battery. Throttle valves working correctly. The ignition a 100%. Good earthing. Good compression. All these things indirectly change the vacuum values. This means that the Metering unit and pump will not work as designed.
Peter Douglas Winn
A happy Triumph owner.

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Andy Thompson
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Re: Fuel consumption

#8 Post by Andy Thompson » Sun Mar 10, 2019 6:49 pm

I had a LHD 2000 - bog standard that I drove carefully so max ~ 70mph - cruising long distances at about 60mph as I was in no position to rebuild the engine and it gave 32-35mpg consistently (didn't really change after fitting overdrive, I just drove a bit faster.
Perth WA
1970 2500PI estate
1964 2.7PI saloon
1973 2100 EFI Megasquirt
1972 Stag

http://triumphwestoz.blogspot.com/

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