Fuel - K100

The best and most proven way to increase fuel mileage is to SLOW DOWN. Works every time.

Ron

After checking I would not put this stuff in ANY diesel because it does have akly in it. Your money and your engine.

MSDS for K-100

Aaaaaaaaaaaa the OP has a Duramax not a gas rig.

No I don't use additive in any of my diesels and haven't since I owned any of them. Most of them have mostly kerosene in them anyway. Make sure this stuff has no alky in the mix. Some do and that is BAD news for a diesel engine.

As far as alky in gas engines go. Alky has WAY less BTU's and you will NEVER get better mileage to do the same job as straight gasoline.

Airstreamer67 wrote:
I've read that premium 92 octane does not contain ethanol. That alone would increase fuel mileage.

Not true, ethanol increases octane and you might even be getting more of the stupid stuff.

Higher octane may of may not increase fuel mileage. If your engine engine knock sensor did not detect pinging there will be no change in mileage.

I've read that premium 92 octane does not contain ethanol. That alone would increase fuel mileage.

When I worked in HVAC, and drove my work van 300 - 500 miles a week, I used to get 10 MPG on Shell gas. I started filling at Cheveron or Mobil gas stations and got 11 MPG, so stopped buying Shell gas. Arco, Shell, and BP are all the same brand of gas, I would get 10 MPG with those brands. 11 with Cheveron or Mobil.

With my motorhome, I normally got 7 MPG at 63- 68 MPH. My last trip, I could not afford the gas, and so set the cruise control at 55 and bought 92 octane gas. One section, I got 8.8 MPG, while going from San Diego to Bakersfield, going over some steep mountains in the process.

Congress will tell you that you get no better fuel mileage while using higher octane fuel. Test it for YOURSELF in your vehicle. You should find a difference. The fuel management system will find the engine is not pinging, and will advance the timing, you will get more HP out of the engine, and it can run leaner without pinging.

All modern engines have fuel injection, and a ping sensor. When the electronics detect pinging (ultrasonic pings, nothing you could hear) it can do three things to reduce the pinging. Enrichen the fuel mixture, changing the timing to make less power, downshift to a lower gear, so the engine spins faster. All three will decrease the MPG.

Those with a Ecoboost will find that the fuel mileage is significantly reduced while towing - unless they use higher octane fuel. Running solo will also provide better mileage with 92 octane.

Fred.