'03 Heavy Chevy

Bumping for more input

Segfault

So why are you punishing your kid in such an evil way. Park your truck in your backyard if you think you may need it to pull something and get a car. Get a car for your son, too. A Cavalier made me happy https://chevroletforum.com/forum/cav...er-rant-62851/ ... or reserve your Elio Elio Motors: Ultra High Mileage Vehicle or get something else, there is no need to drive a truck to haul your 200 lbs body ... unless there is a 3000 lbs ego tied to it. In this case I recommend go and see a shrink, will be sheaper in long run.

'03 Heavy Chevy

Wow that is not a helpful response and totally uncalled for......

Alan_In_MA

After reading through ALL the posts, agreeing with some, wondering about the others... Figured I'd throw my 2 cents in.

I have a 2011 Silverado LS Ext Cab, 30,9xx mi. Actually, went through ALL the gas options. 87 up to 93. NO difference in what she did for mileage, as far as the average goes. Put $60.00 in of 87, You get more gas than $60.00 of 93.

So in my eyes, I paid same amount to get less gas, and didn't see a noticeable difference in performance. So, I typically stay w/ 87, put 93 in her, on occasion.

Joe1500

I currently own a 2007 Tundra Crewmax, 5.7 (4:10 gears) with 130,000 miles on it. I am considering a Silverado for my next truck. It all depends on the gas mileage. I like what they did with the truck but dependability will out way the bells and whistles.

I tow an RV that weighs about 7,000 lbs. with no problem, I live in Florida, (no hills). I get 16 to 17 mpg city/highway if I keep my foot out of it on my daily driving and 8 to 9 towing with reg. gas and I got 10.5 using high test over the holiday weekend. I had to see for myself AND premium gas does get me better mileage (towing or not).

From what I have read on line etc. (Motor Week, Auto Guide) the trucks that deactivate cylinders get the same as I do but I don't have to deal with that surging and searching for the right gear, my step son has a 2010 1500 5.3L and I drove it for a week while he used my truck to tow the RV. He does not care for that either and his truck got the same mileage as mine.

Any info on the 2014 will be appreciated. Thanks. Joe

tech2

if your running a low compression engine or a n/a engine, higher octane fuel is a complete waste of money. Stock class racers have known this for years; higher octane fuel will make you run slower. Put it in a high comp engine or s/c or turbo engine it will lower knock retard so the engine can advance the timing greatly increasing power with some increase mpg also.


afm accounts for approx. 4%increase in mpg

Pugly

not that anyone cares but I average 15 in my 2011 2500HD 6.0L

your computer is programmed for the recommended octane

the higher the octane the slower it burns - to compensate or to take advantage of the slower burning fuel you have to advance your ignition timing - that's not something you can do or something your computer is going to do

I went from mid-grade to premium in my 5.0L Mustang and advanced the initial timing 4 degrees and picked up 2 mpg - more than paid for the 10 cents a gallon more I paid for the premium

it's not going to happen with the newer vehicles

If I changed my driving habits I have no doubt I could get another 1 mpg out of my truck but it's not worth it to me

tech2

That is exactly what the ecm does for every car that has a knock sensor. the ecm will advance the ignition timing. if the knock sensor detects detonation, the ecm will retard the timing until the knock stops.


I run a s/c engine. there is much more timing advance when I run premium. My n/a car with premium, not so much...no noticeable difference.

Lineman2338

I've been having the same thing happen in my 2011 Tahoe. It never seems to go to V4 and the mileage has continued to drop (AVG about 12.5). Normally on my older vehicles, I would check out the EGR valve. I can't seem to find any useful info on this topic and year model.

Lineman2338

I'm thinkin' this guy fell out of the tree he was huggin' to respond to this post while riding his Segway...... Trucks are for real men Hippie!!