As I have 14" wheels I appreciated that my speedo and odometer were under reading so I set up my GPS and went for a drive up the freeway and back where there are no traffic lights so the GPS distance will be almost spot on. I covered 35km by the odometer and 39.1 by the GPS so the odometer needs to be adjusted by 1.117x to show the correct distance. The same correction needs to be made to the speedo to get the correct speedo at slower speeds but it is almost spot on at 80kph.
I am a bit anal about keeping fuel records for my vehicles and the Haffie is no different. On the first fuel fill of 110km I returned 14.56l/100km (19.4 proper mpg) which is lower than the numbers predicted in the specifications - I accept that much of these kms were on the freeway with the engine high in its rev range but I would have expected a bit better. The second tank of 185km including about 120km of offroad work returned 13.6l/100km (20.77mpg) again not as good as I expected. By comparison my Range Rover Sport weighs 2.5 tonnes, has a 2.7 litre engine and when cruising at 120kph returns 9.4l/100km (30mpg) so the haffie even at the designated specs is not real economical.
So what do other people get in their haffie? I think I will put mine in for a full electronic tune up. One thing that did show up going offroad was the engine compartment really sucked in the dust so the air intake would have been doing the same so I think as a priority I will connect up the cyclonic air intake at the front to suck in fresh air as I have all the pipework in my spares.
Some interesting stats on the 40km freeway trip. The Haffie was able to pull the whole freeeway legs in 5th gear including the hills. Max speed was 86kph at 5200rpm, with a no assistance max speed of 80kph at 4800rpm (the tiny tach jumpas around a bit). Best cruise speed is about 72kph at 4200rpm and the Haffie seems to like that speed and revs. Average speed overall was 61kph which included the non freeway sections.
Certainly driving the Haflinger around town and to take me down to get my morning coffee is doable - even short freeway trips but I would have to stay away from Freeways in Western Australia as it is an offence to drive slower than 20kph under the speed limit.
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garry