TT/ Tri VS Road Bike- How much faster?

If there's one question that I am asked more than any other question, it's "how much faster is a TT bike than a Road bike?  To answer the question I went into the FASTER Wind Tunnel in Scottsdale, Arizona to find out.  FASTER is now closed; A2 Wind Tunnel in Mooresville, North Carolina is a great facility for testing cycling aerodynamics.  Comparing my Canyon Speedmax with my Canyon Ultimate: my lowest drag Road bike position (bar tops & hands close together, near the center) required 204.6250 watts to maintain 30 mph with a CdA of .2770 compared to my lowest drag TT bike position which required just 177.2925 watts to maintain 30 mph with a a CdA of .2400.  That's a difference of 27.3325 watts or 13.36%.  And, compared to my more comfortable Road bike position (on the brake hoods) which I could sustain for a long period of time, there was a difference of 62.0523 watts or 25.95%, nearly 26%. The tables and graphs below provide more detail about the tests.

BRAKE HOODS/ ROAD KIT

AERO BARS/ TRI KIT

RAW DATAPaul Lew, "Bicycles make friends"