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Daniel Wilson
Daniel Wilson,
Category: Medium and Heavy Trucks
Satisfied Customers: 5586
Experience:  Owner at DJ Wilson
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I HAVE a ISX 550 horsepower cummins engine with 18918

Customer Question

I HAVE a ISX 550 horsepower cummins engine with 18918 gearbox and a 373 axle. I am getting 5.7 MPG is that the best i can get with that set up
JA: What is the complete model and serial number of your machine?
Customer: 9900i serial # 3HSCHAPRXBN315373
JA: Anything else you want the equipment mechanic to know before I connect you?
Customer: No. No codes showing .
Submitted: 11 months ago.
Category: Medium and Heavy Trucks
Expert:  Daniel Wilson replied 11 months ago.

Hi my name is***** will be glad to try to help. Click on this link for some more in depth factors effecting your fuel economy. That is around the average for this engine but there are some things you might be able to do to try to improve it before getting into gear ratio changes or other engine upgrades. click below and let me know

fuel economy