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Message:: [QUOTE="Desperado, post: 1124992, member: 14482"]Alot of C15 guys on here , you will get some pretty good input . I run a Cat 475 multi torque fuel pump in my W900L and I average 5.9 mpg running around 1350 to 1450 rpms . Get in a hurry and run over 1500 rpms and the mileage will go down quick . Parts are parts , they all cost money . I really can't tell you if Cat cost more . I do run with the "CAT" extended warranty and will renew it when it expires . I consider it cheap insurance . Cat also has a special till the end of year . Get the overhead set , jakes set and the give you a free PM . Not a bad deal . I run heavy loads in my reefer coast to coast so my 5.9 mog average is not too bad . Cat just ran the ECM info last week and told me do not change a thing . I do run a APU for the ac and heat so no idle time when sleeping . Good Luck to ya . <img src="styles/default/xenforo/smilies-vb/roundies/biggrin_25519.gif" class="mceSmilie" alt=":biggrin_25519:" unselectable="on" />[/QUOTE]