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Sold
by simon8201 - 09/09/26 01:46 PM
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Wales
by Joske Vermeule, September 1
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Forums39
Topics49,896
Posts838,016
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Most Online1,063
Jun 14th, 2026
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Joined: Feb 2009
Posts: 135
L - Learner Plates On
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OP
L - Learner Plates On
Joined: Feb 2009
Posts: 135 |
I've never really bothered calculating before but I've just topped up with Shell V Power 98 Octane after our trip to Buxton for MOG mmX and am pleasantly surprised. 1991 +4 M Type with Rover 2 Litre twin-cam engine and a reasonably heavy right foot!  43.41 Miles per gallon
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Joined: May 2009
Posts: 3,727
Green & Grown Up Talk Morgan Addict
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Green & Grown Up Talk Morgan Addict
Joined: May 2009
Posts: 3,727 |
Well Done the +4. I have been keeping a spreadsheet from New due to faulty fuel gauge (now fixed)  The Roadster 100 has averaged 29.2mpg since its first fill up over 1364 miles. The highest period was 38.18mpg The Buxton Trip (yes. we were there)average was 30mpg so that, it would appear is as good as it gets. 
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Joined: May 2009
Posts: 1,558 Likes: 5
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: May 2009
Posts: 1,558 Likes: 5 |
Frank, only a retired person with time to spare keeps a fuel record. don't forget if your speedo is say 10% optimistic, your trip recorder will be also, which means you haven't covered as many miles as you thought...
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Joined: Jul 2007
Posts: 28,909 Likes: 354
Salty Sea Dog Member of the Inner Circle
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Salty Sea Dog Member of the Inner Circle
Joined: Jul 2007
Posts: 28,909 Likes: 354 |
My '98 +4 T16 consistently ran mid to high 30s. Best was a 'quick' run to Curborough for the Sprint Taster Day (I was running late, so skipped the A435) - virtually 43 mpg keeping close to 3000 rpm in top wherever possible... Kept a book in the car to log miles / fuel (and yes going by the mileometer is not a wholly accurate figure but gives a good idea if things are deteriorating). And no - I'm not retired, though it is a nice thought  ... Cheers,
Graham (G4FUJ)
Sold L44FOR 4/4 Giallo Fly
'11 MINI Countryman Cooper D All4
'90 LR 90 SW
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Joined: Sep 2006
Posts: 7,363
Talk Morgan Guru
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Talk Morgan Guru
Joined: Sep 2006
Posts: 7,363 |
don't forget if your speedo is say 10% optimistic, your trip recorder will be also, which means you haven't covered as many miles as you thought... When I've checked my Mog's speedo's against the speed shown on the TomTom, usually it reads nearly 10% fast.  This alters the mpg figures produced tremendously! 
Brian
1970 Morgan Plus 8 - Moss Box (Indigo Blue)
2014 Morgan SP1 (Rocket Red)
2015 Morgan Plus 8 (Rocket Blue)
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Joined: Feb 2009
Posts: 135
L - Learner Plates On
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OP
L - Learner Plates On
Joined: Feb 2009
Posts: 135 |
There's always someone that puts a "downer" on good news! 
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Joined: Sep 2006
Posts: 7,363
Talk Morgan Guru
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Talk Morgan Guru
Joined: Sep 2006
Posts: 7,363 |
Sorry! 
Brian
1970 Morgan Plus 8 - Moss Box (Indigo Blue)
2014 Morgan SP1 (Rocket Red)
2015 Morgan Plus 8 (Rocket Blue)
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Joined: Feb 2009
Posts: 135
L - Learner Plates On
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OP
L - Learner Plates On
Joined: Feb 2009
Posts: 135 |
All in the best possible taste! 
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Joined: Jul 2007
Posts: 28,909 Likes: 354
Salty Sea Dog Member of the Inner Circle
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Salty Sea Dog Member of the Inner Circle
Joined: Jul 2007
Posts: 28,909 Likes: 354 |
Mileometer and speedometer are not necesarily both overreading. The older 'mechanical' head units had different internal drive mechanisms with the mileometer mechanically driven by gears (no reason for inaccurate measurement), where the speed reading was done magnetically, and is adjustable. The speedo on RTA reads slow (yes, I know, illegal, but I suspect it's a function of age - I feel slower nowadays too  ), but the mileometer is reasonably accurate. I know the electronic mileometers are also separate from the speed reading - the trip meter on my +4 did not agree with the main mileometer :shocked:. The only way to check is against measured road distances and these can be wildly inaccurate too . Cheers,
Graham (G4FUJ)
Sold L44FOR 4/4 Giallo Fly
'11 MINI Countryman Cooper D All4
'90 LR 90 SW
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Joined: Oct 2007
Posts: 1,502
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Oct 2007
Posts: 1,502 |
When I've checked my Mog's speedo's against the speed shown on the TomTom, usually it reads nearly 10% fast. This alters the mpg figures produced tremendously! My 4/4 electronic speedo, compared to my Garmin, is almost exactly correct at most speeds. This is important for a different reason of course - I can't rely on speedo error to keep me safe from speed traps. When I last checked my 4/4 (1800 zetec) brim to brim I got 42mpg. NIgel
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