All done before noon on 6/2/09 in personal LAN server, alone. Not personal all-time records. A 15 lap game was done on each map (13 good laps), and the best lap's screenshot is posted. All laps done in the normal circuit, without a 'running start' or 'straight thru' finish.
All-Time BESTS (that I recall):
timberland = 46.13 (shinnbob & 54slow witnessed)
sidewinder = 85.-- (i think it was .
sidewinder (all navs) = 74.23 (shinnbob & 54slow witnessed)
deathisland = 55.03
infinity = 98.97
infinity (allnavs) = 88.20
dangercanyon = 74.-- (dont remember... 74 someplace)
gephyrophobia = 54.23
icefields = 69.40
bloodgulch = 60.82
Note: Done in public servers and could be affected by lag produced by connection.