It's probably going into the combustion chamber. This usually happens
when you have:

1. Worn piston rings

2. Worn valve stem seals

If the cylinder walls/rings are worn then a High Mileage oil may help.
Synthetics like Mobil-1, and especially their High Mileage versions,
are said to burn off less because of the higher viscosity:

http://www.mobiloil.com/USA-English/...ge_10W-30.aspx



On Nov 8, 2:04*pm, "techman41...@yahoo.com" <techman41...@yahoo.com>
wrote:
> I have noticed that my Accord has been using oil on long freeway
> drives (400 miles +)
> I seem to be low 1/2-1quart after a long freeway drive.
> I may also be losing oil on normal driving (but its probably less).
> I don't see any leaks when the car is parked. Not sure if its being
> burned or whats happening to it.
> Has anyone else experienced this on their Honda engine?
> Do those oil treatments help? Which ones would you recommend