I have a 2021 F150 with the 3.5 ecoboost a friend has a 2017 with the 2.7. With over 8000km on my truck, the average fuel consumption is 11.4l/100km. His truck has around 130,000 on it, and average fuel consumption is around 11.2l/100km. Another friend has a 2019 with the 3.5, and his mileage is averaging just over 12l/100km. A fourth friend has a 2019 with the 2.7, and gets around 10.9l/100km. The 2021 3.5 has a new tune, which adds 25hp, around 30ft lbs, but it also gets noticeably better fuel economy than the 2020. The newer 2.7 with a 10 speed also does better on fuel than the older 6 speed models. For the best fuel economy, the new 2.7 with 10 speed will do the best, and it actually has decent power, the peak power is at much lower rpm than the V8, so it actually feels stronger than it is. If you want even more power, the 2021 3.5 has 400hp, and 500ft lbs, and it also makes maximum power at much lower rpm than the V8s, so it pulls very hard.
As for adding a kill switch, there is already so much electronic circuitry, I wouldn't add any, just more to go wrong.
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Last edited by elkhunter11; 08-23-2021 at 09:31 AM.
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