Cesar C

So I've finally decided on a 2.7 but the dealer only has it with a 3.73 electronic locking axel.

I won't be towing or hauling anything. My main concern is getting the most fuel economy as a daily driver mostly city.

Should I go with the 3.73? Or what would best fit my needs?

NASSTY

Sounds like a match made in heaven. 3.73's will hurt MPGs more on the highway than they will in city driving.

CreepinDeth

Exactly what he said.

I have a 3.73 EcoBoost 3.5L SuperCrew and
I get better city MPG then I do highway.....

17mpg highway average on a 2900 mile trip recently.
Worst I got on a tank was 16mpg @ 75mph,
Best on a tank was 18.8mpg @ 70-75mph
(Zero ethanol 87 octane from TN)

17.5mpg city on 100% Chicago suburb roads going to and from work.

I thought something was just wrong with my truck but the gears are better for city MPG.

Cesar C

Different dealer just called they have a 3.31 with a lower sticker price. How would a 3.31 rate in city driving mpg?

Cesar C

I thought the lower the ratio the better the mpg? Why is the 3.73 better for city MPG?


I'm really overwhelmed with all this information. I want the perfect truck setup that best fits my needs but I just should've bought the first truck I liked and not worried about all the details. Too much research.

NASSTY

The 3.73's will get you moving with less throttle which helps in the city. But with 3.73's on the highway the engine will run at a higher RPM than it will with 3.31s.

tanked_darren

Get the 3.73

Cesar C

Will this ratio work with combined HWY/CITY?

SteveLord

Get the best gears out the door. The power will be there should you ever need it and it increases resale value.

Having the lower gears is no guarantee that you'll get whatever magical MPG ratings you're envisioning. On paper sure, it is bound to be better. But if you spend 5 minutes looking up everyone's MPGs on here, you'll see they can be allover the place.

Besides, changing gears in the future is labor intensive and expensive.

Redwings

I just purchased the 2.7 eco with the 3.31. lot's of power and I am getting about 20 mpg in the city.