PRICE POSTINGS FOR THE MONTH OF: August 2011 LEE D. VENDIG, II OIL & GAS CONSULTANTS, INC. NYMEX REPORTED TRADE DIFFERENTIALS NYMEX Cal. Day Average (Including W&H) $85.9877 Platts PPlus $2.8135 NYMEX Cal. Trading Day Average (Excluding W&H) $86.3407 Platts Mid/Cush ($0.4610) 1/3 2/3 Roll ($0.6033) Platts WTI/WTS ($1.0285) Platts WTI/LLS $17.5885 Platts WTI/HLS $18.1450 Argus PPlus $2.8270 Argus Mid/Cush ($0.4570) Argus WTI/WTS ($1.0285) Argus WTI/LLS $16.9315 Argus WTI/HLS $18.4260 Plains Oklahoma Sweet/Sour Differential ($12.5000) TEXAS CRUDE TYPE Chevron Coffeyville ConocoPhillips CountryMark Flint Hills Lion Oil (Ergon) Murphy Oil Navajo Refining NCRA Plains Marketing Shell Trading (US) Sunoco West Texas Intermediate $82.5565 $82.3900 $82.6077 $82.4274 $82.6935 $82.5726 $82.4855 $76.3230 $82.4677 $82.6032 $82.4516 $82.4377 $82.4597 West Texas Intermediate - Area #1 $81.9677 West Texas Sour $79.7777 $72.3230 $79.4677 $79.8532 $77.4516 $79.9377 $77.4597 West Texas Sour (34 ) $77.8065 West Texas Sour Adj. B $79.0355 West Central Texas $82.4677 $82.6032 West Central Texas Intermediate $82.6077 $82.4516 North Texas Sweet - (Intermediate) $82.5565 $82.6077 $82.4677 $82.1032 $82.4516 $82.4377 $82.4597 North Texas (Cooke & Grayson) Sweet $82.4677 North Texas (Cooke & Grayson) Sour $78.7177 North Texas Sour $81.0032 $79.9377 East Texas Field $81.9677 $81.8532 East Texas (other than E. TX Field) $81.9677 East Texas Sour $75.7177 East Texas Light Sour $79.9677 East Texas Condensate $81.4677 East Texas $82.3065 East Texas Sweet $81.6935 $81.8532 $82.4516 East/East Central Heavy Hawkins East/East Central Heavy Talco South Texas Light (Sweet) $80.5565 $89.3952 $76.2177 1 Enterprise (formerly Teppco) Valero
South Texas Heavy $80.6774 $75.9677 $75.6032 $75.2016 South Texas Sour $73.6774 $70.7177 $70.6032 $76.3277 South Texas Valley Sweet $80.4274 South Texas Light $75.6032 $75.4516 $80.7097 Texas Upper Gulf Coast $76.2177 $75.4516 Texas Central Gulf Coast (Giddings) $76.2177 Gulf Coast Mix $80.4274 Upper Texas Gulf Coast $80.6774 $79.1877 Texas Gulf Coast Light $75.6032 $80.9377 Texas Gulf Cost Low Cold Test $80.7032 Coastal Grade A $74.7016 Giddings Sweet Texas $80.4274 Pearsall Sweet $80.1774 Texas Giddings $75.6032 $75.4516 Texas Panhandle $81.9677 $81.6032 $81.9597 Texas Panhandle All Fields $82.1077 Eagle Ford $89.3952 $82.4677 $82.4516 $82.4377 Eagle Ford Condesate $81.4274 $81.4677 $81.4516 $81.4377 Eagle Ford Light $85.8387 $82.4677 Eagle Ford West $89.2500 Eagle Ford West Condensate $81.4274 NEW MEXICO New Mexico Intermediate $82.5565 $82.6077 $82.4274 $82.4677 $82.1032 $82.4516 New Mexico Intermediate Trucked $81.4855 New Mexico Intermediate Pipeline $81.4855 New Mexico Sour $82.1577 $79.4677 $81.0032 $77.4516 New Mexico Sour (34 ) $77.8065 New Mexico Sour Trucked $80.8355 New Mexico Sour Pipeline $80.8355 New Mexico Navajo Sour Pipeline $81.8355 LOUISIANA North Louisiana $81.7177 North Louisiana LCT North Louisiana Condensate $81.2177 Ferriday Area North Louisiana Sweet $81.9435 2
North Sweet $81.9932 Delhi/North Louisiana $81.7016 Central Louisiana Sweet $81.9677 Central Louisiana LCT $82.2177 South Louisiana Light Sweet (onshore) $80.9677 South Louisiana Eugene Island (onshore) $77.9677 South Arkansas and North Louisiana Sour $76.9677 South Sour (onshore) $78.1032 South Sweet (onshore) $81.0000 South Louisiana $81.2016 LLS Onshore $81.3577 Heavy Louisiana Sweet (Onshore) $103.8790 Light Louisiana Sweet (Onshore) $102.1290 MISSISSIPPI Mississippi Light Sweet $80.9677 Mississippi Light Sour $79.4677 East Mississippi $75.3532 West Mississippi $80.9532 COLORADO Colorado Southeastern $73.4677 D-J Basin $81.4274 $71.0177 Colorado Western $69.5477 Western Colorado $74.4877 Eastern Sweet $70.9877 Southeast Colorado $81.1097 North Central Colorado $77.4577 North East Colorado $77.4577 Western Colorado $68.6710 UTAH Black Wax $70.6677 Utah Sweet $69.0810 San Juan/Paradox Basin ILLINOIS Illinois Sweet $77.7177 Illinois, Indiana & Kentucky $77.9680 3
INDIANA Indiana Sweet $77.7177 KANSAS Kansas Common $75.5200 $75.5730 $73.9677 $74.6032 Eastern Kansas $73.5200 $70.3230 $73.2177 Eastern Kansas Common $73.2177 Eastern Kansas Common Special $68.6677 Northwestern Kansas Sweet $74.4677 Southwestern Kansas Sweet $74.7177 Central Kansas Sweet $75.3177 South Central Kansas $78.0200 Kansas Southwest $74.8532 Kansas $81.4597 NEBRASKA Nebraska Western $71.0177 Nebraska Intermediate $73.5200 $73.8230 $72.4677 NORTH DAKOTA Williston Basin Sweet $78.5726 $72.2977 Williston Basin Sour $67.8226 $60.9977 North Dakota Light Sour $78.2974 North Dakota Light Sweet $79.4274 North Dakota Medium Sour $74.2974 North Dakota Northern Area $69.4274 North Dakota Sour $58.9274 North Dakota Southern Area $77.4274 Williston Basin North $71.7377 North Dakota Sweet OKLAHOMA Domestic Sweet (Cushing) $82.4677 $82.4516 Oklahoma Sweet $82.5565 $82.3900 $76.3230 $82.4677 $82.4516 $82.4377 Oklahoma Sweet Special $78.4677 Oklahoma Sweet (Except Panhandle & Northwest) $82.3532 Oklahoma Intermediate $81.9516 Oklahoma Sweet Central $82.4677 4
Central Oklahoma Sweet $82.4077 Western Oklahoma $77.9677 Western Oklahoma Sweet $75.8230 $81.7016 Oklahoma Panhandle $77.4677 $81.6032 $81.9597 Oklahoma Panhandle All Fields $82.1077 Oklahoma Northwest $81.6332 Northwest Oklahoma Sweet $81.9597 Oklahoma Sour $77.8065 $70.0200 $69.9677 $70.1032 $70.4516 $72.4877 Oklahoma Condensate $79.1690 Oklahoma Condensate Light $77.5235 WYOMING Wyoming Southwestern Area $74.0477 Wyoming Sweet Other Areas $73.7977 Wyoming General Sour $62.2477 $58.4435 $66.4787 Wyoming Asphaltic Sour $57.1774 $60.2977 $57.4435 $66.4787 Wyoming Sweet $73.7700 $78.9274 $79.8377 Wyoming Heavy Sour, using FHR's published gravity scale L $62.8474 Wyoming Medium Sour, using FHR's published gravity scale L $63.9474 Wyoming/Montana General Sour $58.1774 Wyoming Heavy Sour $63.1152 Wyoming Medium Sour $64.2152 Wyoming Southwest $76.7377 Wyoming Sweet (Other) $72.7377 Southwest Wyoming Sweet $72.8681 North Wyoming/South Montana Sweet $78.4477 MONTANA Central Montana $73.5577 ARKANSAS Arkansas Sweet $81.9435 Arkansas Sour $77.1935 Arkansas Extra Heavy $65.4435 5