Mine is a V6 auto with the 3.15 axle.

I recently had a chance to drive about 50 miles in a EB Premium with the 3.31 axle. This car felt more powerful than mine. It just drove different. It seemed to be quicker off the line and also when accelerating while driving in 6th. Sometimes the V6 would seem sluggish if I didn't downshift but this car seemed to have more instant power even in top gear.

There's a difference in torque between the two engines - 280 to 320ft lbs. So I am wondering if that made the difference, or the axle? I've heard that a higher ratio makes the car faster (probably the reason the GT has 3.55 gears) but I don't quite understand the tech behind it.

 

The I4 not only makes more torque, it makes it lower in the power band compared to the V6.

The shorter ratio helps as well. But 3.15 to 3.31 isn't a huge difference.

Shorter gears help you accelerate more quickly and also reduce top speed (assuming it's gear limited) in the process. What it basically means is that you can run through each gear more quickly. It increases engine RPM for any given speed, which results in more power available due to the higher engine RPM.

 

Hmmm. interesting. I did notice that the gas mileage was noticeably lower in the I4 than the V6. You really can't get this kind of perspective on a car when shopping and the salesman goes with you on a test drive around the block. It takes some real-world driving.

 

Right?! And the fuel economy of the EB is dependent entirely on your right foot. You can get great MPG if you stay out of boost. But then it feels like a normal 4banger, which is no fun. It should be called Eco Or Boost

 

What's the point of having forced induction if you stay out of the boost?

 

Shorter gears WILL be a detriment to your mileage as well (more RPMs for any given speed).

 

^ This. The cool thing about turbo is the power you get out of a smaller displacement. The power and tq is what people love about turbo.

But in the last decade it's been bastardized as a way to "cheat" on fuel efficiency. Set up the car so that at MPG test protocol speeds you're out of boost and you get good numbers, but once you're on the gas your economy goes out the window.

 

I mean, it's the same with my V6 anyways...stay off the pedal, get great mileage. I can get the rated 28mpg just fine keeping it under 2000 rpm (until I'm on the freeway at least) with quite a bit of city driving mixed in. Hell, I've gotten 36mpg doing ALL freeway (65mph, didn't stop the whole time).

 

36???? I just drove a one-tank trip from MS to Dallas a few weeks ago and got a steady 28 according to the computer. One occupant, little extra weight, cruising at 75, only 2 stops.

 

Well, those two stops will kill you, and doing anything over 70 means much worse mileage.

I was doing 65 the entire way. I could probably hit 40 if the road was nice and smooth, zero elevation changes and zero stops.

 

It's similar with the V8.
I've been surprised with the decent mileage I'm getting with my Coyote.
Keeping my foot out of it I get up to 23/24mpg.
Of course it's hard to keep my foot out of it.