got it from Fwd email:

    Currently there are a few petrol purchase related
    credit cards in the market. Lets do a detailed review
    or analysis on these few cards. Imagine spending
    RM300/month on petrol and getting a 3% rebate convert
    to a RM108 savings yearly!!!!! Ok ready, get set GO!!!

    BHP
    - UOB ( also available for SCB and Affin but i am not
    going to discuss about this )

    UOB offers 2% cash rebate (redeemable after accumulate
    RM50) for both classic and gold card

    Use this card together with BHP E-points, 1 point for
    RM1 purchase of petrol and you can redeem RM5 for each
    500 epoints you have. That convert to another 1% of
    rebate

    Therefore the total rebate for using UOB with BHP
    Epoint is 2%+1%= 3%

    Petronas
    - Maybank (Petronas VISA)

    Offer 5X treat points (TP) for every RM of petrol
    purchases. You need to spend RM1800 in order to get
    9000TP which is redemable for RM50 (RM10X5 worth of
    petrol voucher). This convert to a rebate of 2.78%
    (RM50/RM1800). BUT 5X EXTRA POINTS IS ONLY VALID TILL
    31 JULY 2008.

    Use this card together with Petronas Mesra Card, every
    RM1 purchase of petrol will get 1 mesra point. If you
    use RM7600 on petrol, u are entitle for RM50 cash
    voucher which is equivalent to another rebate of 0.66%

    Therefore the total rebate for using Maybank with Kad
    mesra is 2.78%+0.66%= 3.44% (THIS CALCULATION IS ONLY
    VALID TILL 31 JULY 2008 BECAUSE OF THE 5X POINTS
    PROMOTIN BY MAYBANK)

    - CIMB (Petronas Master)

    CIMB offers 2% cash rebate for both classic and gold
    card

    Use this card together with Petronas Mesra Card, every
    RM1 purchase of petrol will get 1 mesra point. If you
    use RM7600 on petrol, u are entitle for RM50 cash
    voucher which is equivalent to another rebate of 0.66%

    Therefore the total rebate for using CIMB with Kad
    mesra is 2%+0.66%= 2.66%

    Shell
    - Citibank

    Offers 1.5% rebate (classic card and assume no balance
    carry forward) while 2.5% rebate (gold card and assume
    no balance carry forward)

    Use this card together with Bonus Link Card, every RM1
    purchase of petrol will get 1 Bonus Link point (there
    is bonus points structure too). If you use RM5200 on
    petrol, u are entitle for RM50 cash voucher which is
    equivalent to another rebate of 0.96%

    Therefore the total rebate for using Citibank Card
    with Bonus Link card is 1.5%+0.96%= 2.46% for classic
    and 2.5%+0.96%=3.46% for gold card

    Other Banks

    Please take note that RHB also has travel money points
    which offer 5X points for all petrol purchases on any
    petrol station.

    CONCLUSION:-
    If you can get classis card only, then I suggest you
    to use UOB (total 3% rebate). If you can get gold
    card, then go for Citibank (total 3.46% rebate).

    If you are too lazy to make payment (or it's really so
    inconvenient for you to make payment at Citibank or
    UOB), then use Maybank or CIMB bank.

    For the lazy bums, I suggest you to take Maybank (if
    you fancy the 5X treat points) else just go for
    CIMB... personally I think MBB and CIMB provides
    equivalent service...

    Hope this helps to summarize almost all of the petrol
    linked credit cards in Malaysia. Adios!!!