Lorne Chabot has the best career goals-against average by a Maple Leafs goalie, with a 2.16 average.

which goalie has the lowest all-time gaa for the maple leafs
Interpreted as:
Which goalie has the lowest all-time gaa with a minimum of 125 games played for the maple leafs?
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ChabotLumleyHainsworthJosephBowerBelfourBrodaAndersenRoachBernierReimerPotvinChadwickGambleToskalaPalmateerBesterWregget2.162.182.262.492.502.512.532.792.802.802.842.872.892.953.083.444.064.35
NAMEGPGAAGSWLTOTLSAGASVSV%SHOMIN
Lorne ChabotLorne Chabot2142.1610278314713113078
Harry LumleyHarry Lumley2672.18103106581,6965811,539.9073416003
George HainsworthGeorge Hainsworth1472.26794820345199157
Curtis JosephCurtis Joseph2702.49260138972717,2576566,601.9101715808
Johnny BowerJohnny Bower4752.502191577914,6071,13913,468.9223227369
Ed BelfourEd Belfour1702.5116993611144,7754224,353.9121710079
Turk BrodaTurk Broda6292.533042221021,6086138182
Frederik AndersenFrederik Andersen2682.7926714974368,4667267,740.9141315625
John Ross RoachJohn Ross Roach2222.8098107176391313673
Jonathan BernierJonathan Bernier1512.801405968174,6363934,243.91568407
James ReimerJames Reimer2072.841888576236,1195295,590.9141111176
Felix PotvinFelix Potvin3692.87701601494911,1331,02610,107.9081221461
Ed ChadwickEd Chadwick1802.895789345,2995194,780.9021410792
Bruce GambleBruce Gamble2102.958384316,6655736,092.9141911649
Vesa ToskalaVesa Toskala1453.081406254204,0184263,592.89458287
Mike PalmateerMike Palmateer2963.44129112418,8869647,922.8921516828
Allan BesterAllan Bester2054.066991166,2797405,539.882710941
Ken WreggetKen Wregget2004.3555112176,1187905,328.871210902