Problem with trip Computer

Ask to dealer as it is a warranty issue.

I'm not familiar with the Subaru version, but I've seen this behaviour in other cars. The reading is instantaneous fuel mileage, not averaged? If so, you can see such a variation. For instance, when you are coasting with the throttle closed, the mileage will be very high, since you are not using any fuel, and when you are at full throttle, it will be very low.

Not clear to me from your message if it's working okay or not. If it varies this much when you are simply cruising steadily on a flat road, no throttle changes, then indeed you have a warranty problem.

Larry Van Wormer

They do tend to jump around quite a bit on the "instant" mileage setting. A lot depends on your throttle application, the vehicle load, whether the vehicle is travelling up or downhill etc.

If you go one step further on the computer you should get an overall consumption figure which on my 05 OBW I have found to be most reliable.

Good luck.

Current consumption reading is just that - it's what the fuel flow is at that instant. It just shows how much fuel you can waste tromping rapidly on the gas pedal.

Instead, I find it useful to keep the average consumption showing and reset one of the odometers each time I fill up.

I generally use this setting if I am going up grades and want to see how much difference the throttle makes with grades generally since it is an instantaneous readout. The average consumption which is the next setting up, is the one you should use.

Ron

My 2005 Subaru has identical behavior. I think current fuel usage stat is useless, I only use average, which seems to be very accurate