I don't draft much and when I do, it's at the back of not-so-fast groups. On my long wheelbase bike, the front wheel is so far in front of me, I can only estimate how far away I am and with the short wheelbase bike, the front wheel is tucked in under the bottom bracket/crank. Same with our tandem. Never very close but can still feel a positive effect. Easier to keep up than to catch up is very true.
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Bacchetta Giro A20, RANS V-Rex, RANS Screamer