There's a weak link or two: the consumer-at-large & the cost of high-octane fuel. Know anyone that has a nice car that says 'Premium gasoline recommended' on the filler, but still fill it up with '87? I do. lotsa DILLIGAS out there.

I do know that Ford has a completely different program for the flex-fuel side of the tuning on my 11th gen. Something to the tune of 30 ft/lb and 10 or 20hp.. The '11+ trucks got a smarter computer that will take advantage of higher octane levels, unlike the earlier gen trucks that were tuned from the factory for 87, even though a carb-n-dizzy setup would have had to run 93 to keep it from rattling the pistons out of it. The computers are definitely smart enough to aim for optimum fuel/timing and correct for off-spec conditions, like crap gas.

10% doesn't sound far off, considering a solid 100°F drop in exhaust temp for running the e30 gas.


Good numbers with the fuel energy up there.
Wanna figure out Stoich and put up air-specfic power numbers?

 

Just curious. How are you measuring EGT? My Kenwood receiver lets me see a PID that says EGT from the OBD but I don't know where it comes from.
And since Stoichis different for ethanol than gas, I wonder how they do that.

 

I'm pretty sure it was from the cat temp sensors. The action of the Cat-Cons could have an effect, but if the engine is running clean-n-mean like it should be, that effect is minimized. Basic CarnotCycle/thermal efficiency says the lower the temperature of your waste stream, the more efficient your conversion process is. I guess the should be more along the lines of the delta between peak temperatures (unknown, but likely similar) and exhaust temperature.
At any rate, getting the same mileage out of a fuel with 10% less energy does indicate better thermal efficiency of engine operating parameters.

 

Just filled up today and got my best mpg ever: 264 miles with 13.392 gallons = 19.71 mpg!!! This is my daily driver (about 90 m/day) and mostly highway driving. Even had the a/c on a few times (99 today!) I consistently get between 18 - 19, but getting over 19 is a bonus so I'm pretty happy about that!

 

I recently had my first 850+ mile tank, could have pushed over 900 since I had 2-3 gals left. Hand calc was 25.2 on that tank. I can get better often but then a windy day or truck duties bring it back down to reality.

Average the last 2500 miles is about 25.

 

I guess you drive a lot slower than I do.

 

 

2010 here. how do i reset the mileage or is avg just set to total miles on truck?

 

 

Another road trip, another 22.2 mpg recorded. 21.7 on the northward drive, over 575 miles, about 3/4 freeway at 75-76 mph, 1/4 backroads varying between 50-60 mostly.
The 22.2 was the return trip with similar driving conditions.
It looks like the cat-back Borla Touring exhaust has had NO ill effects on mileage.