Currently, 1990 Toyota 4x4 truck, 3.0 liter V-6, 360,000 miles on Castrol straight 30wt full-biologic oil.
Burns a quart every 1,000 miles. So what? It's barely broken in.
Currently, 2006 GMC Sierra 4x4 truck, 5.3 liter V-8, aluminum block, 110,000 miles on Castrol Syntec 5w-30 Synthetic. Uses a quart about every 3,000 miles or so.
Previously, 1984 Ford T-Bird, 3.8 liter V-6, went 254,000 miles on Pennzoil straight 30wt full-biologic, finally died due to electrical fire, engine was fine.
Previously, 1974 Ford T-Bird, 460 V-8, went over 200,000 miles on Pennzoil straight 30wt full-biologic, every 200 miles it took 25 gallons of fuel and a quart of oil, but man was it smoooooooth.