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Diesel Truck Poor Mileage?
1994 Chevrolet K3500 6.5L Turbo Diesel (Detroit Diesel)
- Dual Rear Wheels
- 189,000 Miles
- 4X4 ( I drive it in 2WD though)
- New Tires. Properly Inflated.
- Had Oil Changed Recently (used Shell Rotella 15W-40)
- 4L80E Transmission with Overdrive.
- New Green Lifetime Air Filter (very similar to K&N Filter)
This truck only gets 10 MPG city and 11.5 MPG on the highway just driving, not towing anything. I know trucks like this aren't known for their fuel economy but this stuff seems odd to me. The RPMs at 55 MPH is around 2250 RPMs. The RPMS at 65 MPH is around 2750 RPMs. This seems awfully high to me. Also, at 65 MPH (with cruise control on) it will go faster, then slow down. Then it will pick back up to 65, speed up over 65 and then go back down. It repeats this pattern.
Something seems wrong here. Any ideas what it could be? Differential ratio to high? Any suggestions would be greatly appreciated
Theres a dozens of possible reasons for poor economy, dirty injectors, worn drivetrain components, etc etc. It seems to me it should be getting better milage than that, so I would take it to a reputable shop and have it serviced.
You might consider the single most common reason for poor milage too, its also the simplest, low tire pressure.
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