The chart at the bottom of this web page identifies a trend favouring horses drawn in stalls away from the High rail towards the Centre of the course when the stalls have been positioned High.
York racecourse have positioned the stalls Centre in most 5F and 6F sprints for older horses, 28 may 2004 to end 2006.
This top chart shows the results with stalls positioned Centre.
The faster ground down the Centre of the course on good or better going will still exist, but at present we should not assume that horses drawn in middle stalls will be those most favoured in the long term.
The trends shown here are very short term, and consist of very small samples.

Major drainage work was carriued out at York in 2008.  These charts show resultsv before that

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Horse racing draw advantage bias  York 6F    Stalls Centre
See 2nd chart below for ALL results, Low, and High

There are not yet enough results here to make an accurate assessment of the draw with stalls Centre,
The chart has been split into thirds as per the Racing Post "Top Draw" method.
This allows us to identify the Middle stalls, highlighted in green.
Either side of the Green cells is either the Low third or High third of the runners.
Blue and yellow show the Top 6 and Bottom 6 stalls as usual.

On good or better going, there is the start of a spread of results in races of 20 runners.
Stalls 1 to 6 won 11 of 21 races 52%, a very low percentage for 6 stalls.
The Top 6 stalls won 8 races.
1 winner was dead centre.
On good or better going, the Middle stalls won 8 of 21 races.
Stalls Centre.  On good or better going, in races of 8 - 16 runners, the Middle third of the stalls won 7 of 10 races 70%.
In 2006, the Middle third won only 2 of 5 races under those conditions.
So far, in races under those conditions,  there have been zero wins from the Top third of the draw.
10 races is a very small sample, but it may be worth keeping an eye on developments here over the next couple of seasons.

On good/good to soft in places or softer going, the Middle stalls won 5 of 14 races.
Results are spread across most stalls, but in races of 16 or more runners, the Top half of the draw won only 1 of 9 races.
There is no recommendation on this type of going.

2006 results :- 1-8, 2-10, 5-11, 4-12, 6-14, 2-16, 7-17, 3-20, 6-20, 16-20, 20-20
                      All 2006 races had stalls Centre

2005 Stalls Centre results :-  9-11, 9-11, 9-13, 10-15, 18-18, 1-20, 2-20, 6-20, 6-20, 10-20, 10-20, 11-20

2004 Stalls Centre results :-  5-8, 1-11, 5-11, 1-12, 11-13, 8-15, 8-19, 3-20, 11-20, 14-20, 16-20, 16-20, 

These would be the "Top Draw" splits for the Low third, Middle third and High third :-
8 runner split Low, Middle and High = 3 stalls, 2 stalls, 3 stalls :
9 runners  = 3,3,3: 10 = 3,4,3: 11 = 4,3,4: 12 = 4,4,4
13 = 4,5,4: 14 = 5,4,5:  15 = 5,5,5:  16 = 5,5,6: 17 = 6,5,6:
18 = 6,6,6: 19 = 6,7,6: 20 = 7,6,7 etc. 

YORK 6F    Stalls usually positioned HIGH ( Low are shown L )

During 2004 the stalls were positioned Centre for the first time.
Prior to 2004 we had the makings of a promising pattern favouring Low stalls 
( those positioned towards the Centre of the course, away from the High rail).
On good or better going, stalls 1 - 6 won 25 of 51 races 49 %.
That is a very low percentage for 6 stalls.

Stalls High.  On good or better going, in races of 8 - 16 runners,
stalls 1 - 6 won 18 of 24 races  75 %.

Above 16 runners, wins gradually spread to higher stalls.
This pattern of wins with the stalls positioned High, is towards the middle of the course, or at least away from the High rail, which would indicate an advantage towards the Centre of the course.

On good/good to soft in places or softer going (results shown in red) winners are spread across most stalls.

2006 results :-  All races had stalls positioned Centre.  See Top chart.
2005 results :-  All races had stalls positioned Centre.