ake wrote:What is your average speed to achieve these rather good mpg figures?
Of course, I would never go faster than the
national speed limits for the Ordinary Van's vehicle type. The journey in prospect was 600 miles, for which I would normally allow 12 hours total, if the time at destination was not critical. It took less than 12 hours in both directions anyway, just taking it steady and with one brief stop - more haste less speed, etc. I didn't record exact times and distances to calculate the overall average speed, but from the above it was over 50 mph including the stop in the total journey time.
Target highway speeds:
- Motorway: <65 mph indicated (approx. 62 mph on GPS)
- Dual carriageway: 60 mph indicated
- Single carriagway (mostly the A9): 50 mph on GPS
Sometimes slower, sometimes faster, depending on conditions.
It can be difficult to maintain 50 mph on single carriageways because of impatient car drivers who haven't read their Highway Code or have forgotten the speed limits. In the same way, they seem not to know that HGVs are limited to 40 mph. There was a 'speed trap' on the A9 on the northbound leg.
On the way up, traffic reports indicated an accident in the Preston area (M6, Jct 31 and 32), so we diverted onto side roads which must have affected the fuel consumption. On the way back, the wind was from the north, and there was more commercial traffic which kept the speeds down, particularly on the A9. These fuel consumption figures are in near-ideal conditions - a long run and no big hurry. The overall average since purchase (total miles/total gallons) is currently 39.28 MPG.