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How do you know is burning oil. Do you see smoke? Are you loosing alot of oil? Do you smell it?Do you see puddles of oil. Does your exhast pipes have oil residue in it? NEED MORE INFO?
This can sometimes happen after a 1000 or more miles of city driving followed by a highway trip. The engine might have consumed a normal amount of oil, but because of fuel and water dilution from city driving the dipstick registers full. Once you go on a highway trip, the fuel causing the dilution could heat up and evaporate, giving the appearance of rapid oil consumtion.just my thought.
I agree, that's definitely one possibility, at higher speeds the engine works harder, it may bot burn oil at lower speeds, but it can be forced around at higher speeds