Grabbed this list off a closed FB. They update pretty regularly. The tests were either via the test tube method or via flex fuel reading, etc.
ALGONQUIN
THORTONS
2095 E Algonquin Rd, Algonquin, IL 60102
E75....TESTED ON 06/09/16
ARLINGTON HEIGHTS
BP
2250 S. Arlington Heights Rd. Arlington Heights
E80....TESTED ON 04/27/16
BATAVIA
THORTONS
1495 E Wilson St. Batavia,il 60510
E71....(Read on AP)...tested on 04/29/16
BLOOMINGDALE
THORTONS
190 E Lake St. Bloomingdale, IL 60108
E90...TESTED ON 7/27/16
BURBANK
SPEEDWAY
79th and Harlem
E90....TESTED ON 07/27/16
BURRIDGE
SPEEDWAY
9059 IL RT83 Burridge, IL 60527
E90....TESTED ON 05/14/16
BYRON RACETRACK(JUST OF I-39 ON ROUTE 72)
BP
5534 N Limestone Rd, Monroe Center, IL 61052
E74…TESTED ON 04/17/16
CARPENTERSVILLE
Road Ranger / FastMart
7030 Huntley Rd, Carpentersville, IL 60110
E89 / E90.....TESTED ON 07/26/16
CHANNAHON
MOBIL
26950 W. EAMES ST. Channahon,IL 60410
E90...TESTED ON 05/20/16
CHICAGO (NORTH OF 290)
CITGO
CLARK AND BELLIE PLAINE
4070 N Clark St, Chicago, IL 60613
E88…TESTED ON 05/13/16
CHICAGO (SOUTH OF 290)
SHELL
4900 S Cicero Ave, Chicago, IL 60638
E65....TESTED ON 05/31/16
CICERO
BP
3100 S Cicero Ave, Cicero, IL 60804
E900......TESTED ON 06/25/16
DARIEN
SPEEDWAY
7502 S Cass ave Darien,IL
E82....TESTED ON 05/05/15
DEKALB
Pacific Pride
880 Peace Rd, DeKalb, IL 60115
E88 tested on 7/27/16
DES PLAINES
SPEEDWAY
885 Touhy Ave, Des Plaines, IL 60018
E85....TESTED ON 06/17/16
ELK GROVE
Thortons
Elmhurst and Devon
E74...TESTED ON 7/26/16
FRANKFORT
FOOD N' FUEL
19420 Harlem Ave, Frankfort, IL
E90....TESTED ON 06/26/16
HICKORY HILLS
SHELL
9459 S Roberts Rd, Hickory Hills, IL 60457
E72...TESTED ON 03/04/16
HOMER GLEN
SPEEDWAY
151ST/ S BELL RD HOMER GLEN,IL
E80....TESTED ON 07/01/16
SPEEDWAY
12007 W 159th St, Homer Glen, IL 60491
E90....TESTED ON 07/21/16
JOLIET
FOOD ANF FUEL
2401 S Chicago St, Joliet, IL 60436
E85....TESTED ON 05/21/16
THORTONS
Easington and Theodore
1602 Essington Rd, Joliet, IL 60435
E75........TESTED on 05/08/16
KILDEER
BP
20915 N Quentin Rd, Kildeer,IL 60047
E95...TESTED ON 07/01/16
LA SALLE
BECKS
359 3rd Street La Salle, IL 61301 (near starved rock)
E85......TESTED ON 06/20/16
LISLE
MOBIL
RT. 53 AND MAPLE RD.(local P&L Motorsports)
5500 Lincoln Ave, Lisle, IL 60532
E87....TESTED ON 07/05/16
LOCKPORT
THORTONS
Webber Rd. And Renewick
15918 S. Weber Rd. Lockport,Il 60441
E83.....TESTED ON 04/06/16
LOMBARD
ROAD RANGER
909 E. Roosevelt Rd. Lombard,il 60148
E71......TESTED ON 03/02/16
SPEEDWAY
SWIFT RD AND NORTH AVE
21 W 400 North Ave, Lombard, IL 60148
E88...TESTED ON 07/13/16
MELROSE PARK
SHELL
2201 Mannheim Rd, Melrose Park, IL 60164
E90......TESTED ON 06/23/16
MOKENA
GAS N' WASH
8810 W 191st St, Mokena, IL 60448
E85...TESTED ON 05/06/16
MONTGOMERY
SPEEDWAY
2110 Orchard Rd Montgomery,IL 60538
E90.....TESTED ON 06/26/16
MORRIS
MOBIL
1501 N Division St, Morris, IL 60450
E93....TESTED ON 07/09/16
NAPERVILLE
SPEEDWAY
631 N Route 59, Naperville, IL 60563
E82...TESTED ON 10/22/15
NEW LENOX
SPEEDWAY
CEDAR RD AT IL HWY
939 S Cedar Rd, New Lenox, IL 60451
E60...TESTED ON 04/03/16
FOOD N' FUEL
ROUTE 6 AND CEDAR RD
2510 N Cedar Rd, New Lenox, IL 60451
E80/82..TESTED ON 04/03/16 B
NORTH AURORA
WOODMANS
151 Hansen Blvd, North Aurora, IL 60542
E88.....TESTED ON 07/06/16
NORTHLAKE
SHELL
70 E North Ave, Northlake, IL 60164
E85....TESTED ON 04/06/16
ORLAND HILLS
SHELL
16707 La Grange Rd, Orland Hills, IL 60487
E70.....Tested on 03/01/16
ORLAND PARK
SHELL
14301 Wolf Rd, Orland Park, IL 60467
E74...TESTED ON 10/20/15
OTTAWA....EXIT OFF OF I-80 AND COLUMBUS ST
THORTONS
102 W Etna Rd, Ottawa, IL 61350
E81.....TESTED ON 05/08/16
PALATINE
MOBIL
1490 N Quentin Rd, Palatine, IL 60067
E80.....TESTED ON 05/22/16
PALOS HEIGHTS
POWER MART
6400 W 127th St, Palos Heights, IL 60463
E86...TESTED ON 05/18/16
PALOS HILLS
SHELL
10300 Harlem Ave, Palos Hills, IL 60465
E70....Tested on 02/19/16
PALOS PARK
SHELL
13059 S. Lagrange, Palos Park,IL
E73....TESTED on 03/08/16 \
PLAINFIELD
SPEEDWAY
RENWICK AND RT. 30
15919 S. Lincoln HWY, Plainfield,il 60544
E85...TESTED ON 07/09/16
ROMEOVILLE
SPEEDWAY
WEBER RD AND I55
1300 Normantown Rd. Romeoville, IL 60446
E74...TESTED ON 03/28/16
SCHAUMBURG
Thorntons
Barrington Road just north of Schaumburg Road
E78
SHELL
2501 N Meacham Rd, Schaumburg, IL 60173
E65....TESTED ON 05/23/16
SCHILLER PARK
BP
4111 Mannheim Rd, Schiller Park, IL 60176
E80ish....TESTED ON 01/29/16
SHOREWOOD
SPEEDWAY
RT.59 AND BLACK
800 Brook Forest Ave Shorewood,IL 60404
E86...TESTED ON 07/03/16
GAS N' WASH
Rt. 52 and River Rd.
(No exact address at this time)
E84....Tested on 05/21/16
SPRINGFIELD
ROAD RANGER
500 Toronto Rd, Springfield, IL 62711
E85.....TESTED ON 06/24/16
WEST DUNDEE
SPEEDWAY
115 N 8th St, West Dundee, IL 60118
E79.....TESTED ON 07/05/16
WOODDALE
THORTONS
110 W Devon Ave, Wood Dale, IL 60191
E70(Cobb FF).....01/19/16
WOODRIDGE
THORTONS
2401 63rd St, Woodridge, IL 60517
E78........TESTED on 03/15/16
ALGONQUIN
THORTONS
2095 E Algonquin Rd, Algonquin, IL 60102
E75....TESTED ON 06/09/16
ARLINGTON HEIGHTS
BP
2250 S. Arlington Heights Rd. Arlington Heights
E80....TESTED ON 04/27/16
BATAVIA
THORTONS
1495 E Wilson St. Batavia,il 60510
E71....(Read on AP)...tested on 04/29/16
BLOOMINGDALE
THORTONS
190 E Lake St. Bloomingdale, IL 60108
E90...TESTED ON 7/27/16
BURBANK
SPEEDWAY
79th and Harlem
E90....TESTED ON 07/27/16
BURRIDGE
SPEEDWAY
9059 IL RT83 Burridge, IL 60527
E90....TESTED ON 05/14/16
BYRON RACETRACK(JUST OF I-39 ON ROUTE 72)
BP
5534 N Limestone Rd, Monroe Center, IL 61052
E74…TESTED ON 04/17/16
CARPENTERSVILLE
Road Ranger / FastMart
7030 Huntley Rd, Carpentersville, IL 60110
E89 / E90.....TESTED ON 07/26/16
CHANNAHON
MOBIL
26950 W. EAMES ST. Channahon,IL 60410
E90...TESTED ON 05/20/16
CHICAGO (NORTH OF 290)
CITGO
CLARK AND BELLIE PLAINE
4070 N Clark St, Chicago, IL 60613
E88…TESTED ON 05/13/16
CHICAGO (SOUTH OF 290)
SHELL
4900 S Cicero Ave, Chicago, IL 60638
E65....TESTED ON 05/31/16
CICERO
BP
3100 S Cicero Ave, Cicero, IL 60804
E900......TESTED ON 06/25/16
DARIEN
SPEEDWAY
7502 S Cass ave Darien,IL
E82....TESTED ON 05/05/15
DEKALB
Pacific Pride
880 Peace Rd, DeKalb, IL 60115
E88 tested on 7/27/16
DES PLAINES
SPEEDWAY
885 Touhy Ave, Des Plaines, IL 60018
E85....TESTED ON 06/17/16
ELK GROVE
Thortons
Elmhurst and Devon
E74...TESTED ON 7/26/16
FRANKFORT
FOOD N' FUEL
19420 Harlem Ave, Frankfort, IL
E90....TESTED ON 06/26/16
HICKORY HILLS
SHELL
9459 S Roberts Rd, Hickory Hills, IL 60457
E72...TESTED ON 03/04/16
HOMER GLEN
SPEEDWAY
151ST/ S BELL RD HOMER GLEN,IL
E80....TESTED ON 07/01/16
SPEEDWAY
12007 W 159th St, Homer Glen, IL 60491
E90....TESTED ON 07/21/16
JOLIET
FOOD ANF FUEL
2401 S Chicago St, Joliet, IL 60436
E85....TESTED ON 05/21/16
THORTONS
Easington and Theodore
1602 Essington Rd, Joliet, IL 60435
E75........TESTED on 05/08/16
KILDEER
BP
20915 N Quentin Rd, Kildeer,IL 60047
E95...TESTED ON 07/01/16
LA SALLE
BECKS
359 3rd Street La Salle, IL 61301 (near starved rock)
E85......TESTED ON 06/20/16
LISLE
MOBIL
RT. 53 AND MAPLE RD.(local P&L Motorsports)
5500 Lincoln Ave, Lisle, IL 60532
E87....TESTED ON 07/05/16
LOCKPORT
THORTONS
Webber Rd. And Renewick
15918 S. Weber Rd. Lockport,Il 60441
E83.....TESTED ON 04/06/16
LOMBARD
ROAD RANGER
909 E. Roosevelt Rd. Lombard,il 60148
E71......TESTED ON 03/02/16
SPEEDWAY
SWIFT RD AND NORTH AVE
21 W 400 North Ave, Lombard, IL 60148
E88...TESTED ON 07/13/16
MELROSE PARK
SHELL
2201 Mannheim Rd, Melrose Park, IL 60164
E90......TESTED ON 06/23/16
MOKENA
GAS N' WASH
8810 W 191st St, Mokena, IL 60448
E85...TESTED ON 05/06/16
MONTGOMERY
SPEEDWAY
2110 Orchard Rd Montgomery,IL 60538
E90.....TESTED ON 06/26/16
MORRIS
MOBIL
1501 N Division St, Morris, IL 60450
E93....TESTED ON 07/09/16
NAPERVILLE
SPEEDWAY
631 N Route 59, Naperville, IL 60563
E82...TESTED ON 10/22/15
NEW LENOX
SPEEDWAY
CEDAR RD AT IL HWY
939 S Cedar Rd, New Lenox, IL 60451
E60...TESTED ON 04/03/16
FOOD N' FUEL
ROUTE 6 AND CEDAR RD
2510 N Cedar Rd, New Lenox, IL 60451
E80/82..TESTED ON 04/03/16 B
NORTH AURORA
WOODMANS
151 Hansen Blvd, North Aurora, IL 60542
E88.....TESTED ON 07/06/16
NORTHLAKE
SHELL
70 E North Ave, Northlake, IL 60164
E85....TESTED ON 04/06/16
ORLAND HILLS
SHELL
16707 La Grange Rd, Orland Hills, IL 60487
E70.....Tested on 03/01/16
ORLAND PARK
SHELL
14301 Wolf Rd, Orland Park, IL 60467
E74...TESTED ON 10/20/15
OTTAWA....EXIT OFF OF I-80 AND COLUMBUS ST
THORTONS
102 W Etna Rd, Ottawa, IL 61350
E81.....TESTED ON 05/08/16
PALATINE
MOBIL
1490 N Quentin Rd, Palatine, IL 60067
E80.....TESTED ON 05/22/16
PALOS HEIGHTS
POWER MART
6400 W 127th St, Palos Heights, IL 60463
E86...TESTED ON 05/18/16
PALOS HILLS
SHELL
10300 Harlem Ave, Palos Hills, IL 60465
E70....Tested on 02/19/16
PALOS PARK
SHELL
13059 S. Lagrange, Palos Park,IL
E73....TESTED on 03/08/16 \
PLAINFIELD
SPEEDWAY
RENWICK AND RT. 30
15919 S. Lincoln HWY, Plainfield,il 60544
E85...TESTED ON 07/09/16
ROMEOVILLE
SPEEDWAY
WEBER RD AND I55
1300 Normantown Rd. Romeoville, IL 60446
E74...TESTED ON 03/28/16
SCHAUMBURG
Thorntons
Barrington Road just north of Schaumburg Road
E78
SHELL
2501 N Meacham Rd, Schaumburg, IL 60173
E65....TESTED ON 05/23/16
SCHILLER PARK
BP
4111 Mannheim Rd, Schiller Park, IL 60176
E80ish....TESTED ON 01/29/16
SHOREWOOD
SPEEDWAY
RT.59 AND BLACK
800 Brook Forest Ave Shorewood,IL 60404
E86...TESTED ON 07/03/16
GAS N' WASH
Rt. 52 and River Rd.
(No exact address at this time)
E84....Tested on 05/21/16
SPRINGFIELD
ROAD RANGER
500 Toronto Rd, Springfield, IL 62711
E85.....TESTED ON 06/24/16
WEST DUNDEE
SPEEDWAY
115 N 8th St, West Dundee, IL 60118
E79.....TESTED ON 07/05/16
WOODDALE
THORTONS
110 W Devon Ave, Wood Dale, IL 60191
E70(Cobb FF).....01/19/16
WOODRIDGE
THORTONS
2401 63rd St, Woodridge, IL 60517
E78........TESTED on 03/15/16