I’m planning a trip from the UK to northern Spain in my C40 dressed in this rig (Thule Roofbox and 2 e-bikes on a rack):
I wanted to know the impact on efficiency so did a little ABA test today. I tracked efficiency and average speed on a 33 mile round trip section of the M40 north of Oxford. Conditions were a chilly 13c with a 6mph wind coming out of the north-east.
I couldn’t control for traffic but to the best of my ability tried to maintain a constant 70 mph. With turn around the average speed on both trips was 67mph so I didn’t do too badly.
On the first trip (unburdened) I averaged 35.7 kWh/100 miles.
On the second (with bikes and Roofbox), I averaged 42.8 kWh/100 miles.
That’s a penalty of 20% which is about what I had expected. Will use that in ABRP for planning purposes.
I wanted to know the impact on efficiency so did a little ABA test today. I tracked efficiency and average speed on a 33 mile round trip section of the M40 north of Oxford. Conditions were a chilly 13c with a 6mph wind coming out of the north-east.
I couldn’t control for traffic but to the best of my ability tried to maintain a constant 70 mph. With turn around the average speed on both trips was 67mph so I didn’t do too badly.
On the first trip (unburdened) I averaged 35.7 kWh/100 miles.
On the second (with bikes and Roofbox), I averaged 42.8 kWh/100 miles.
That’s a penalty of 20% which is about what I had expected. Will use that in ABRP for planning purposes.
