a. NGL-to-crude oil ratio at 60% for 2013.b. NGL-to-crude oil ratio at 50% for 2013.c. NGL-to-crude oil ratio at 40% for 2013.

The analysis further assumes derivative instruments outstanding as of November 2, 2012, and production volumes estimated through December 31, 2013. The range of stated hypothetical changes in commodity prices considers current and historic market performance.
   
        Natural Gas Price (Henry Hub)

Crude Oil Price (WTI)
 

NGL-to-Crude oil ratio (1)
  $ 2.50     $ 3.00     $ 3.50     $ 4.00     $ 4.50
  60% of WTI   $ 699     $ 694     $ 689     $ 683     $ 678
$110 50% of WTI   $ 606     $ 601     $ 596     $ 591     $ 585
    40% of WTI   $ 517     $ 512     $ 507     $ 502     $ 496
60% of WTI   $ 668     $ 662     $ 657     $ 652     $ 647
$100 50% of WTI   $ 585     $ 580     $ 574     $ 569     $ 564
    40% of WTI   $ 504     $ 499     $ 494     $ 488     $ 483
60% of WTI   $ 634     $ 628     $ 623     $ 618     $ 613
$90 50% of WTI   $ 561     $ 556     $ 551     $ 545     $ 540
    40% of WTI   $ 488     $ 483     $ 478     $ 472     $ 467
60% of WTI   $ 611     $ 605     $ 600     $ 595     $ 590
$80 50% of WTI   $ 546     $ 541     $ 535     $ 530     $ 525
    40% of WTI   $ 481     $ 476     $ 470     $ 465     $ 460
60% of WTI   $ 592     $ 587     $ 582     $ 577     $ 572
$70 50% of WTI   $ 536     $ 530     $ 525     $ 520     $ 515
    40% of WTI   $ 479     $ 473     $ 467     $ 462     $ 456
    (1)   The composition is based on MarkWest’s average projected barrel of approximately: Ethane: 35%, Propane: 35%, Iso-Butane: 6%, Normal Butane: 12%, Natural Gasoline: 12%.

The table is based on current information, expectations, and beliefs concerning future developments and their potential effects, and does not consider actions MarkWest management may take to mitigate exposure to changes. Nor does the table consider the effects that such hypothetical adverse changes may have on overall economic activity. Historical prices and ratios of NGL-to-crude oil do not guarantee future results.

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