When I switched from my Raleigh C200 last year to a road bike there was definitely a noticable difference, but I wouldn't think .7 to 1, not even close.
But it really depends on speed. The advantages of a road bike become more significant the faster you go. It is definitely way more difficult to maintain 30 mph on my hybrid than it is on my road bike. But if you're riding in the high teens, then I would say that 15-16mph on my hybrid equals the effort of about 17-18 mph on my road bike.
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If once a man indulges himself in murder, very soon he comes to think little of robbing; and from robbing he comes next to drinking and Sabbath-breaking, and from that to incivility and procrastination.
- Thomas De Quincey