2014+ Gas Mileage (MPG) Topic

bass mechanic · August 5, 2014

So i set the cruise control at 57MPH from Concord NH to Boston about 75 miles and this is what I got: almost 27MPG!

I wish people would quit posting these! Look! Anyone can get 27 mpg over 25 mile average! Shit man I've gotten as much as 36 mpg over 25 miles while I was headed down the mountain pass!

If you did 75 mile trip show is your best 50 mile per gallon average. Better yet 400 miles then you have something to be excited about! Here I'll post an example for you.

And BTW I have a 6.2 d cab and my average mph was 70 over the 407 miles oh and I also crossed the continental divide during this trip which includes 4 mountain passes some of which are 8% grades

Edited August 5, 2014 by bass mechanic

Johnnyee · August 5, 2014

This Message deals with Fuel Mileage while Towing.

I just got back from a 6,800 mile trip from Houston, Tx through Colorado, Utah, Idaho, Washington, Oregon, California, Arizona, New Mexico and then back home. I was towing a 6,000 lb travel trailer, and had about a 1,000 lbs of people, dogs, and equipment in the truck. I consistently maintained a speed of 60 mph. I used premium fuel through out the trip, but the octane ratings ran from 93 in the Houston area to a low 90 octane in parts of the Northwest. My average fuel price per gallon ended up at $3.93 and my average, hand calculated fuel economy was 11.69. As others have mentioned, the DIC is off (higher) by 4.21%. My truck is a '14 Silverado CCSB (standard bed), 6.2L/Max Tow w/Tow Mirrors. I mostly ran with cruise control on, and Trailer Towing OFF. I hope the information helps you. Thanks.

ToesonTheNose · August 6, 2014

My Best 50 Mil is 23.6 best 400 mil is 21.7 so far

ryandemo84 · August 7, 2014

My best so far. Been running 93 octane last couple of tanks. Very pleased with the mpg in this truck.

5.3L 3.42 crew 2WD Airaid intake

NoProblem · August 8, 2014

19 mpg for 6771 miles.

Regular 87 octane gas

2014 Silverado 1500 4x4

Double Cab

5.3 V8

3.08 rear end

Mostly highway miles

Pretty darn good considering it's a V8 with plenty of power whenever needed.

I still think it would be awesome if it had the option of auto or manual switch for V8 / V4 - I bet I could get at least a few more mpg out of it if I could switch it to V4 myself.

Edited August 8, 2014 by NoProblem

Mike1220 · August 8, 2014

19 mpg for 6771 miles.

Regular 87 octane gas

2014 Silverado 1500 4x4

Double Cab

5.3 V8

3.08 rear end

Mostly highway miles

Pretty darn good considering it's a V8 with plenty of power whenever needed.

I still think it would be awesome if it had the option of auto or manual switch for V8 / V4 - I bet I could get at least a few more mpg out of it if I could switch it to V4 myself.

I feel the same way man! Sometimes it seems like it's just a bit too sensitive about switching

SlavO · August 9, 2014

I'm sure it will drop a lot when I get some truck tires... But it's been 50% highway 25% city 25% traffic Not bad at all to me, if I didn't get a exhaust I'm sure it would be better.

TJay74 · August 15, 2014

Problem with switching to V4 is people will destroy the engines. The engine cant handle detonation very well in V4 mode and there is a time limit to V4 mode as well of 360 seconds per cycle until the decay period is meet and then it can go back in again. This is done to keep the other cylinders warm and up to temp and I am sure for other reasons as well.

I turned my AFM off and am still seeing the same if not a little better mileage on mine.

2014Z71LTZ · August 15, 2014

Problem with switching to V4 is people will destroy the engines. The engine cant handle detonation very well in V4 mode and there is a time limit to V4 mode as well of 360 seconds per cycle until the decay period is meet and then it can go back in again. This is done to keep the other cylinders warm and up to temp and I am sure for other reasons as well.

I turned my AFM off and am still seeing the same if not a little better mileage on mine.

I agree, the V4 mode is shifting off because the motor is lugging. if you pay attention to the instant gas mileage when go from V4 to V8 it doesn't change. If you are concerned about not running in V4 mode long enough turn on the tow haul mode it stays in V4 a lot longer. In the process of running a full tank in tow haul mode, so far haven't seen any difference in MPG.

Aaron1085 · August 16, 2014

Sometimes I see a "yellow" colored AFM icon. Anyone else?

Mike1220 · August 16, 2014

Never seen that before. Not sure if anyone else may have any insight into this but if not, then I would go get it checked out Aaron

Smoothbassman · August 16, 2014

I'm happy. Much better than my dodge Ram. Did a 425 mile trip 20 MPG average. 50 mile best 23 MPG. Calculated at the pump at 19.9

fpe5 · August 17, 2014

2014 sierra 4x4 double cab 5.3 . from pennsylvania to florida speed between 65-80 averaged 20.9

brannnor · August 17, 2014

I still not getting the gas mileage I see on here but it is better then my other truck when I check mine the actual is .5-.7 miles to gallon off from the screen Norm

milligan · August 20, 2014

Why are people running premium? Higher octane is only to prevent detonation in higher compression engines and doesn't contain any more chemical energy than regular. Doesn't seem to be worth the 30-50 cents more.