2001 Silverado with 4.8L V-8, automatic, 2WD, no performance mods - it's all completely stock.
I do almost nothing but city driving and get 13.5 mpg. If i take a road trip, say Dallas to Houston, I'll get 16.5 mpg if it's all highway.
Consider, I do have the added weight of a bed liner, loaded tool box and over-sized all-terrain tires.
1998 2wd 1/2 ton Suburban. 21 mpg pure hy 60 mph 12 mpg pure city short trips 15mpg pure city(mild hypermiled-pulse glide)
21 mpg on 3000 mile Hy trips-set CC to 67 mph-on 70-75 mph interstates(2000 miles or so)-New Orleans to Flagstaff
59 mph on Hy 287 (Tx)-700 miles
45 mph road work-maybe 150 miles
35 mph in small towns
60 mph actual driving speed average(-1200 miles- at well above sea level-which improves mpg)
45 psi all around-syn oil Mobil 1 10w30 -syn diff lube 75w140
2007 Silverado (New body) Ext cab short bed z71 4x4, 6.0 Vor. Had 245/75/16's for the last 2 yrs.
just put on kelly 265/75/16.
Over all, 12.2 mpg. tuned superchip gas saver, K&N air filter.
don't really haul much, 8x12 once a week with lawnmower.
mileage is a good mix of city, stop & go and hwy.
2005 Chevrolet silverado 1500 ext cab, standard bed. V8 4.8L 294. Flowmaster series 40 muffler, 265s on 17's. 15hwy and 13.3 city
Keep it going. Who's next?
2013 ecsb 5.3 5" lift 285/65/18, borla exhaust, airaid mit, blackbear tune driving is mostly country roads, 55 mph speed limits and stop signs every 3 miles, and about 15% city driving. These numbers start at the bottom as e85, then switched back to gas. Keeping a lighter foot makes about a 1 mpg difference http://i1200.photobucket.com/albums/...psy1sq9kjw.png