What's new

Fuel economy

Not a 5.0 result, but on a 3.5 eco, going from 87-93 moves my average from 16 to 17.5. Is a 9.5% increase plus I have noticeable power increase. At 15000 miles a year my math shows

87 octane (16 mpg at $2.75/gallon)= $2,578
93 octane (17.5 mpg at $3.10/gallon)= $2,656.

So costs more but more power for under $100/year
 
😂…..So what you’re saying is that in order to get the MPG that I posted, one has to be and or drive like an old man of which I don’t fall into either of those categories.

Got it youngster.
I wasn't saying that at all, I do believe it was a question...
 
I wasn't saying that at all, I do believe it was a question...
And I was just being sarcastic. 🤣
No harm no foul.
All good.
Enjoy your weekend.
 
Scientifically speaking, 93 octane is your best chance from the pump for efficiencies. Economically speaking it doesn’t really prove out after added cost. I ran 93 since day one so I can’t say if anything less would be the same but I could get 700 miles out of a tank for highway trips if I didn’t go above 75. That number is about 600-650 still after my Whipple, strictly highway of course and I’m sure I could probably do a little better if I really tried. Stock I had a 20.1 average
What size tank?
 
I transverse North Carolina too often and I pay way too much attention to the fuel economy of 5.0 with a Whipple. But still I do it as a challenge and can substantiate several previous points made; right around 20.0 is the BEST I can do at 5 over, straight highway trips, so 75 when I can. 70 and below is significantly better. The wind makes about a 1.5-2.0 diff on mine also, headwind vs tail, so a lil tailwind for anything approaching or bettering 20.anything. My mileage from near day one is sitting on 15.5, which includes quite a few 0-105 mph digs, and over 4000 miles of towing, often ~5000# at 11-12mpg, and damn it pulls good. So I’m very happy with my mileage, esp compared to a similar HP RaptorR or TRX.
 
I transverse North Carolina too often and I pay way too much attention to the fuel economy of 5.0 with a Whipple. But still I do it as a challenge and can substantiate several previous points made; right around 20.0 is the BEST I can do at 5 over, straight highway trips, so 75 when I can. 70 and below is significantly better. The wind makes about a 1.5-2.0 diff on mine also, headwind vs tail, so a lil tailwind for anything approaching or bettering 20.anything. My mileage from near day one is sitting on 15.5, which includes quite a few 0-105 mph digs, and over 4000 miles of towing, often ~5000# at 11-12mpg, and damn it pulls good. So I’m very happy with my mileage, esp compared to a similar HP RaptorR or TRX.
Yeah, I'm about to tank my lifetime mpg average with a roughly 3000 mile trip towing over the next 2 weeks...unless plans change (we have an idea where we want to go but it's fluid).
 
36 Gallon, only option for Tremors. Would love to add a transfer tank one day though.
Much more than that can be a real danger in gasoline but some guys have done that on some older gas trucks. One of our Fords is a F-250 super duty Roush diesel with 64 gallon tank gets about 1,200 miles on one tank. I also have the 36 gallon tank but have only managed about 520 miles per tank. Have not run 93 yet only 91 but will see if 93 will make a difference. It is not very common here in Phoenix to find 93.
 
23 ecoboost. 21-22 just driving or freeway trips. Hook up the travel trailer (7000 lbs loaded) 10-11 mostly 10. Beats the 5 or 6 I got with the class a motorhome with v10
 
That’s great mileage. 😎
I’d say you should be able to possibly get another 1-2 MPG’s by reducing your highway cruising speed to something between 55-65.
Do not come to Oklahoma, you will be killed at 55-65 most highways are now 75 or 80 mph.
 
I only have 2k miles on mine. First couple of tanks were on 87. I got 16.8. I decided to try 93. Got 18.7. Doing the math, due to price difference, I dont think the increase pays for itself. That said, the truck runs a hell of a lot better on the 93. Much more responsive to throttle input.
 
My truck showed an average of 15.4 mpg when I bought it with 36k on the odometer.. ptevious owner only ran 87. I jumped to 93 after my first "dealership" fill up was used and went to a 18.6 mpg average with mixed driving in normal. No lift, but some meatier BFG KO3s. I have had a few tanks of pure rolling hill highway driving near 21 mpg. 65-70mph.
 
My truck showed an average of 15.4 mpg when I bought it with 36k on the odometer.. ptevious owner only ran 87. I jumped to 93 after my first "dealership" fill up was used and went to a 18.6 mpg average with mixed driving in normal. No lift, but some meatier BFG KO3s. I have had a few tanks of pure rolling hill highway driving near 21 mpg. 65-70mph.
By far the best way and depending on how you look at it, one of the cheapest ways to get better MPG not to mention getting the advertised HP & TQ figures.
 
By far the best way and depending on how you look at it, one of the cheapest ways to get better MPG not to mention getting the advertised HP & TQ figures.
Its a little tough at times to keep the mph down in that 60-65 range, especially when our main Interstate is 80mph from the corner of the state all the way to Oklahoma City and everyone is buzzing by you at 85mph..... They all probably think to themselves Silly Ford guy buys a Tremor to only drive it like a Grandpa... Every so often I will open it up when I am getting teased by some Chevy Lover. It never ends well for them. 😝
 
Its a little tough at times to keep the mph down in that 60-65 range, especially when our main Interstate is 80mph from the corner of the state all the way to Oklahoma City and everyone is buzzing by you at 85mph..... They all probably think to themselves Silly Ford guy buys a Tremor to only drive it like a Grandpa... Every so often I will open it up when I am getting teased by some Chevy Lover. It never ends well for them. 😝
😂…..I hear and I understand.
I live in Atlanta so I know about how fast people are driving. I just say that as long as I’m in the far right hand lane cruising along, they’re more than welcome to change lanes and go around me. It amazes me here that even though there are 6 to eight lanes on some stretches of interstate, cars and semi trucks like to tailgate me when I’m in the far right hand lane.
 
So we just lost our 93 Octane at Sams Club this week for 91. Question... I found a Casey's which offers 87 and 91 100% real gas option and then the 87/89/91 Ethanol E10 blends.. The 100% stuff is a little more expensive.. Anyone else running "real gas" with good results? Will the truck run better on non ethanol gas?

I heard others here in town complain due to their 93 PRX tunes and now they have to buy octane booster or switch out their tunes. i know I had a significant increase in mpg and performance with my bone stock 3.5 when jumping from 87 to 93. I don't know why Sams changed but there are some unhappy people around here
 
So we just lost our 93 Octane at Sams Club this week for 91. Question... I found a Casey's which offers 87 and 91 100% real gas option and then the 87/89/91 Ethanol E10 blends.. The 100% stuff is a little more expensive.. Anyone else running "real gas" with good results? Will the truck run better on non ethanol gas?

I heard others here in town complain due to their 93 PRX tunes and now they have to buy octane booster or switch out their tunes. i know I had a significant increase in mpg and performance with my bone stock 3.5 when jumping from 87 to 93. I don't know why Sams changed but there are some unhappy people around here
Both 91 ethanol-free (E0) and 91 E10 have the same octane rating, but they differ in composition and real-world behavior. Ethanol-free 91 contains no ethanol, giving it slightly higher energy density, which can result in marginally better fuel economy and more consistent performance under heavy load or high heat. It is also more stable over time because it does not absorb moisture, making it better for vehicles or equipment that sit for extended periods, such as boats, small engines, classic cars, or seasonal and project vehicles. In contrast, 91 E10 contains 10% ethanol, which lowers energy content slightly and can reduce fuel economy by a small margin, but it is cheaper, widely available, and well-suited for modern, frequently driven vehicles. Ethanol does help raise octane chemically, but it also absorbs water and can contribute to fuel system issues if the vehicle is stored for long periods. In everyday driving, power differences between the two are negligible, but ethanol-free fuel offers slight advantages in longevity, storage stability, and high-load conditions, while 91 E10 is perfectly adequate and cost-effective for daily use in modern cars.
 
Back
Top