One and ONLY gas mileage thread please

‘13 Roush SC Screw
Gas mileage before install of fun things (stock everything), 80% backroads with some stop and go traffic, 10% freeway, 10% Offroad and farm use: 12.33
After install of fun things (JDM 700hp kit, ICON stage 4 and 35” Toyo MTs) 10.86

Drive pretty consistent from before upgrades but do use my new responsive pedal (thanks @JDM!) more.

New to me 2014 super crew, getting 13.3 all city, weird since I was lucky to get 11.6 on my scab but love every minute of it. Afe cbi and new Roush side exit exhaust, love the sound

Hope this helps.[emoji16]

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Eco B
Mostly City
15.7mpg
Haven’t reset for 3600 miles
89 octane

I've been running 87-89 Octane in my 6.2L and averaged 12.5-12.8mpg stock, with a cheap turndown exhaust installed I'm at 13.8-14mpg on my normal 1hour work drive I base it off of.

2 city tanks now and Im averaging 13.7 on 87 octane. I dont push it too hard as I daily drove a Hellcat for 2.5 years so this truck is a slow **** ha

7-12 mpg

1. Stock everything - 11-16MPG
2. Method 17" with 37" KM3s - 10-13MPG
3. Fox 3.0 w/ method and KM3s - 9-11MPG

2011 6.2, owned it for 754mi, always 92 octane (10% ethanol).
Best: 11.7 MPG (snowy highway road trip, about 250mi@50MPH average)
Worst: 8.2 MPG
Average: 9.0 MPG

All above calculated by actual fill-ups using fuelly.com, but the trip computer is within 5%.

Usually 13.5-14 under normal driving with a 6.2 and 91 octane. The best I have done is 18. Have to drive like a granny though, So only once. The winter driving puts me at 12-13.