What MPG do 34" tires get? (LLY Duramax)

Here is how much MPG I get with my 2004.5 LLY Duramax extended cab long box 4WD with 5" MBRP straight pipe and 3" MBRP downpipe. 2400 mile experiment, see results at the end!
No tune or other performance mods.
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2004, Chevrolet, GMC, Caddilac, GM, General Motors, Silverado, Sierra, Silverado HD, Sierra HD, Tahoe, Suburban, Suburban HD, Yukon, Yukon Xl, Yukon XL 2500, Escalade, Escalade ESV, ls, lt, ltz, high country, leather seat, leather interior, gray, dark spiral gray, spiral gray, dark gray, silverado 2500HD, sierra 2500HD, 1500, 1500HD, 2500, 2500HD, 3500, 3500HD, 2001, 2002, 2003, 2005, 2006, 2007, 2008, 2009, 2010, lb7, liz, lmm, lml, l5p, l5d, review, duramax, vortec, 6.6, 6.0 gasser, straight pipe, 5”, 5” exhaust, mbrp, downpipes, 3” oil burner, diesel, turbo diesel, turbo, boost, boosted, psi, garrett, bowtie, 1 year review, owners review, truck, heavy duty, 8 lug, allison 1000, 5 speed, 6 speed, refi live, s&b intake, pcv reroute, extended cab, long box, 4x4, air filter, k&n, CB radio, console, cb radio install, MPG, 34s, 34", 34 inch, tires, toyo at2, open country, butte, montana, wyoming, colorado, washington

[@mathewmerkl576]

On my 2005 lly extrended cab long. Box i just calculated out my mpgs yesterday truck is bone stock with stock 245-75-16 winter tires i averaged 17.6 mpg going to and from work which is 25 miles each way average speed of 60-65mph i live in canada speed limit is only 100km/hr as for cold weather i have a espar diesel fired engine heater which brings the truck up to 80* celcius in about 1hr even at minus 30* celcius
Love your truck by the way nice color you dont see very often where i live and its in immaculate shape

[@605LIFE]

Thanks for the comment and for watching! I love the long box with that 34 gallon fuel tank! Yeah these trucks can get relatively great MPGs with the right driving style and tires! Rock on!

[@kountryquads9475]

I have a stock lly do you know what size I can fit with stock suspension? Like 285? What’s your setup?

[@605LIFE]

That's a great question. I can't say for sure but it's very possible you could fit 285s with stock keys cranked up a bit. I installed 1-3" leveling keys in the front (I only have them at about 2" or so, the keys are not ideal but they get the job done for now), and 2" add a leafs in the rear. I'm 99% sure the stock rear will clear 285s no question. My tires are 34"x11.50" and fit with mild trimming. Hope this helps! Thanks for watching!