Interesting

[botus]

On my twin cam there is a marked difference in range between E5 and E10 - on a long journey that is. On my commute to Italy, E10 will force me to fill up sooner. Couldn't give a measurement without studying the map, but for sure there is a difference.

yep, the Twin Can GS is meant to perform better on E5 - its written on the petrol tank / user manual

the 1300 should have a similar gain but when its using E10