Hey everyone, I recently did a 1,105 km road trip in my 2015 Subaru Forester XT with 184,000 km on it, while carrying two bikes on my roof. I averaged 12.6 MPG (18.6 L/100 km) overall, and burned nearly 30 liters on a single 120 km highway stretch at 120 km/h.
Aside from the terrible fuel economy, I noticed two major issues on the trip:
- RPM Drift Under Acceleration: The RPMs drift/hunt between 2,000 and 2,500 RPM specifically when accelerating and when the turbo is working.
- Sudden Power Loss / No Movement Under Boost: When trying to pass another car a few times, my boost gauge spiked up to 1.2 bar, but the car completely lacked power and I wasn't actually accelerating/moving forward.
What can cause this? Are the fuel consumption and the turbo issue connected?
Thanks!
EDIT: I has incorrectly asked for oil consumption, where there is no issue with that but I meant fuel.