Duramax Lifetime Supporter
Join Date: Aug 2008
Absolute best I have ever got is 20.6 MPG. That was empty highway miles at 60 miles an hour. I let the wife drive home that trip and now I have to listen to her tell me I need to slow down so we can get better mileage! Best I (myself, not the wife
)have gotten is 19.8 empty, that was driving about 68 with a slight tail wind. I usually get about 16 -17 around home, that is mixed freeway and in town.
Towing a 7500 lb travel trailer, I get 11-12 MPG usually, depend on the hills I have to go over. Have got as low as 9 once with mostly in the hills but I don't slow down much going up hill.
2005 Chevy Silverado 4x4, 285-70-17's on Hummer wheels. Banks Air inlet system w/scoop. Predator programmer, modified mouth piece.
93 Dodge D250, PDR Twins HX35&HT3B, 60+# boost,PDR stage 2 head w/o-rings, PDR Cam, modified VE Pump, piston style lift pump, modified 5" intake w/AFE, ATS ported manifold,DTT 89% converter, 4" RIP exhaust,modified tranny,EGT/boost/tranny/tach gauges.Rear sway bar.Single stage Water/Meth system installed. Oversized intercooler