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I have a 2003 duramax with 112,000 on it. It started out getting 18-20 mpg empty at interstate speed, 12-16 pulling at interstate speed. About 4 months ago (at roughly 85,000) I noticed a significant decrease in fuel economy, now I'm lucky to get 10-12 empty on the highway, and only 5-7 pulling. My local dealer has ran test after test with no real answer to my problem. Oil and filter gets changed every 3-4000 miles, fuel filter at least every 15000, transmission fluid and filters (internal and external) get serviced regularly. It is in the shop again getting looked at. Dealer has suggested bad thermostats?????? I've replace MAF sensor and turbo senser. Engine has good compression on all cylinders, good balance and no leakage on injectors. I'm running the Edge module with juice, cold air intake, 265 tires.
Anyone have any ideas???
I have a 2003 duramax with 112,000 on it. It started out getting 18-20 mpg empty at interstate speed, 12-16 pulling at interstate speed. About 4 months ago (at roughly 85,000) I noticed a significant decrease in fuel economy, now I'm lucky to get 10-12 empty on the highway, and only 5-7 pulling. My local dealer has ran test after test with no real answer to my problem. Oil and filter gets changed every 3-4000 miles, fuel filter at least every 15000, transmission fluid and filters (internal and external) get serviced regularly. It is in the shop again getting looked at. Dealer has suggested bad thermostats?????? I've replace MAF sensor and turbo senser. Engine has good compression on all cylinders, good balance and no leakage on injectors. I'm running the Edge module with juice, cold air intake, 265 tires.
Anyone have any ideas???