How much less bandwidth does blocksonly use in practice? I recently measured this using two techniques: Once by instrumenting a node to measure bandwidth used for blocks vs all other traffic, and again by repeatedly running in both modes for a day and monitoring the hosts total network usage; both modes gave effectively the same result.
How much is the savings? Blocksonly reduced the node's bandwidth usage by 88%.
Do you care to share the raw data? I would like to independently verify your claim.
edit: the patch to introduced code changes to measure different type of bandwidth would be even better.