I have the same vehicle and bought the Edge Pulsar Module that installs in the engine compartment and can be operated through the steering wheel controls. Easy to change programs on the fly. Picked up our first rv yesterday Transcend 28mks and after driving almost 100 miles averaged 9.3 mpg in Programmed Tow mode.

Ya I took my first trip last week went 250 miles lots of big hills and averaged 7.8MPG, Im not sure what it will do in normal roads I was hoping for 9 or 10 on non hills. Our trip was 60% huge hills. So you dont have any data points before the chip?

For re-flashing on an engine intended for regular grade fuel, here is how this works. Your engine if calibrated properly would have nothing to gain from an aftermarket calibration on regular grade fuel. Where folks will get a small gain typically in the heavy part throttle to wide open throttle (WOT) region is to increase spark advance to burn premium grade fuel. Other tricks can be made to injection timing and cam timing but these would have been optimized from the factory since they do not like to give up free torque and horsepower.
For engines already calibrated to premium fuel, there is no gain to use an aftermarket calibration since factory calibrators would have squeezed all torque and power from the engine. Now there are some exceptions on boosted engines where through analysis will dictate the life expectancy of the engine with X number of WOT cycles. In this case, the engine will be de-tuned to live a long and happy life. Add an aftermarket calibration and it can become extremely expensive when a $30K engine is grenaded. But some are wealthy enough to not care or they simply think all that extra torque and power was left on the table due to the factory calibrators not knowing what they were doing. That would be a costly mistake.

The next thing to consider is voiding your powertrain warranty by just installing the aftermarket calibration. Today manufacturers can tell if the ECU has been re-flashed so if there is an engine failure, there is a good chance you will be on your own for the cost of repairs.

Also want to add that systems that provide an offset can also be detected due to known and expected values of torque delivered to the rear wheels. Some may not have this capability, but I have to believe that most if not all do.

The best option IMO is to leave it alone at least until the factory warranty has expired.

Jim

Yes, with that little gain not worth it, I do run a premium fuel when I tow. 7.5mpg in big hill regions is just what it is, I have not taken any trips on mostly flat surface so I have no indicator of mpg. Perhaps I may get 9 to 10. I know the big hills I try to get speed up before hand but sometimes you cant due to traffic and next thing Im running at 4700 rpm. I have a trip coming up in 2 weeks that is mostly flat so I will see what it will do.

Maybe a K&N filter and different exhaust?

Dennis,

You should not have to run premium fuel in an engine designed for regular grade fuel. Now where an exception comes in is if spark knock is encountered where it would be beneficial to move up to the next higher octane level. Engines calibrated for regular fuel and if no knock is encountered will not experience additional torque and power from premium fuel.
There are some rare exceptions with some control algorithms such as from Bosch where they will advance to premium fuel even though regular fuel is recommended. You can try it during towing and if the fuel economy does not move up considerably on premium, the algorithm does not support premium fuel.

Jim

I have to be careful here but will state that folks that use an oil bath air filter many times will coat them excessively with oil and as a result, will contaminate their mass airflow sensor. Manufacturers do not like to give up torque and power where the gains from such devices would be minimal and only found at WOT.

Also Cat back exhaust systems will sound nice but will gain nothing in additional torque and power since the main restriction are in the catalytic converters.

Jim

Thanks Jim makes since, next trip I will just use regular gas. Just guessing here as a engineer on level ground I should see a small increase in fuel economy. 2 weeks I will be heading out again thanks for all the info. Sites that sell chip systems I know you need to be look through the bs.

I have always been amazed that an entire aftermarket calibration industry (and I go back to when this was rods & jets in carburetors rather than chips in a computer!) exists based on the assumption that the OEM calibration engineers would not (safely) maximize power and torque at WOT (wide open throttle). Part throttle calibration is all about meeting emissions and maximizing fuel economy. If you want more power just press harder on the pedal, which takes you out of the emissions calibration range and into the power range. When the pedal gets to the floor you will have all the power that the engine can produce (chipped or OEM) unless the aftermarket calibration has taken you into an A/F ratio that will give you a little more power at the price of potential engine damage.

Guest Jim has given you the much more technical explanation LOL .

BTW, across about 25,000 towing miles with our 303RLS, we have averaged about 9.5 MPG with the Ecoboost engine running on premium fuel. Most of this is flat land towing but we do cross the Appalachians. I lock out 6th gear so that we run at about 2100 RPM at 60 MPH in 5th gear. This is just into the boosted RPM range where the engine has enough reserve torque to avoid downshifts on gentle hills. If I have to fill up with regular fuel, I can definitely feel the loss of power as the calibration pulls out spark advance.

Rob

Dennis,

Don't be surprised that your 6.4L will exhibit better fuel economy from regular grade fuel as compared to premium fuel. Premium fuel exhibits a slower burn rate and as a result will produce less torque and power than the intended regular grade fuel if the engine is calibrated solely to regular grade fuel.

Now if your ECUs algorithm will advance spark timing based on octane levels above 87(unlikely), you would see significant gains in fuel economy on premium fuel.

Jim

Dennis66 Read your truck owners manual. 6.4l HEMI is recommended premium unleaded. When I responded earlier I did not include that my 9 mpg was running premium.

And also K&N and true dual exhaust not cat back.

I see on some blogs where 89 mid-grade may be recommended and am interested in what the manufacturer recommends. So to make this story consistent, run 89 if this is the recommended fuel and do not change your calibration. At part throttle, the throttle is the restriction NOT the air filter so don't waist your money. At full throttle, the differences are minimal or non-existent. Your manufacturer knows whats best for filtration.
See my earlier comments on voiding your factory warranty. If voiding the factory warranty and breaking the law is desirable, install headers a performance cam and do a re-cal for premium 93 octane fuel and catalyst delete. Plenty of power to be had. For a while.

Jim

Dennis66 Unfortunately chipping a gas engine for economy is not as simple or effective as chipping diesel for the same reasons.