Here's How Much More (Or Less) Fuel-Efficient My Automatic Car Is In Manual Mode 

Kinja'd!!! "MichaelGauby" (michaelgauby)
01/03/2018 at 14:30 • Filed to: Fuel Economy, Gas, Infiniti, G35, College, Money

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Manumatic Transmission

I drive a 2003 Infiniti G35 Sedan. I love the car, it’s comfortable, handles well, and is fast by 4 door standards. I had it for over 2 years before deciding to use the manumatic transmission option, and after several months of almost exclusively using the user-controlled option, I’ve gotten a pretty good idea of fuel consumption.

First, the car in question (5 SPD AT) doesn’t get the gas mileage numbers that I had hoped, likely because I live in a congested college town and rarely drive more than a mile at a time. The first few years of ownership I drove the G exclusively in automatic mode and averaged 16-17 mpg, as compared to the EPA estimated 19 mpg.

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“w/manual shift mode”- If they could only see the article that lead to

On a recent tank of fuel, I used manual mode exclusively, driving like a normal person. I would accelerate quickly when necessary but rarely exceeded 3,500 rpm. I got down to an eighth of a tank and decided to refill. Can you guess what the magic number was?

!!! UNKNOWN CONTENT TYPE !!!

12.8 mpg. Ferrari bad, and this was shifting quickly and spending lots of time in 4th gear at 30 mph. It made me curious about what would happen if I drove like a jackass; so I did just that.

I spent the tank revving high in 1st and 2nd gear and downshifting early. I enjoyed hearing the engine soar above 4000 rpm. People likely thought I was going a lot faster than I was despite never exceeding 50 mph, and you know what my fuel economy was?

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10.8 mpg. Keep in mind this is a Japanese V6 sedan. I know, it’s really bad. And expensive. Safe to say this is a one-time experiment, but it leaves the question, why use the manual option?

I originally thought it was faster, but with the quick 5 SPD AT it’s not, and it’s definitely not more fuel efficient. Maybe you want to sound like you’re going fast in 2nd gear without actually going fast. I don’t know how you drive so give it a try, just don’t come complaining to me when your Toyota Corolla starts guzzling gas like a pickup truck.


DISCUSSION (7)


Kinja'd!!! Takuro Spirit > MichaelGauby
01/03/2018 at 16:29

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I spent a few months in a SKYACTIV Mazda3 with the 6 speed AT & manual mode.

For a few tanks of gas I drove it normally, got 38MPG on my commute.

Then I drove it like a hypermiling grandma, and got 42MPG. Not bad.

Then, I drove like a complete asshat. Redlining, not shifting, full throttle starts and acceleration..... 35MPG.

Mind you there was a LOT of freeway driving in various traffic conditions, but still. 35MPG when driving it like a complete ass for a few weeks.


Kinja'd!!! E90M3 > MichaelGauby
01/03/2018 at 16:30

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I get better fuel economy in my M3 in ATL traffic than that. The worst I’ve gotten is 13 MPG.


Kinja'd!!! MichaelGauby > E90M3
01/03/2018 at 16:43

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Ha technology has come a long ways


Kinja'd!!! MichaelGauby > Takuro Spirit
01/03/2018 at 16:44

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That’s impressive, what was the AT mpg?


Kinja'd!!! Takuro Spirit > MichaelGauby
01/03/2018 at 17:00

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Leaving it in D? That was the 38MPG. Sorry, should have elaborated the other two runs were in manual mode.


Kinja'd!!! Wrong Wheel Drive (41%) > MichaelGauby
01/03/2018 at 17:23

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Oh wow I thought these would do better than my STi on gas. I drove a newer one (2015 Q40) and managed about 29 on the highway over the course of 1000 miles or so at ~90mph most of the way. I generally average around 20 in the STi with almost all of my driving spent in the canyons but I try to keep it out of boost to not get single digit mileage lol.


Kinja'd!!! Nick Has an Exocet > MichaelGauby
01/03/2018 at 17:50

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My drive my Ralliart in full manual but it’s a dual clutch and turbocharged so that’s a bit different. Stay out of boost and you’re golden.

I find the Miata, which is a true manual, it doesn’t really matter how hard I drive it. Small naturally aspirated engines are great like that. Fuel consumption is much more predictable.