When To Shift Gears For The Best Fuel Economy

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When Should You Shift Gears? How To Get The Best Fuel Economy When To Shift For Acceleration - https://youtu.be/zZBqb0ZJSwU EE Shirts! - http://bit.ly/2BHsiuo Recommended Books & Car Products - http://amzn.to/2BrekJm Subscribe for new videos every Wednesday! - https://goo.gl/VZstk7 When is the best time to shift gears for maximum fuel economy? In this video we look at how to drive efficient, how to drive with good fuel economy, and when to shift gears to maximize fuel efficiency. When you're accelerating and shifting through the gears, it's important to keep the engine in an optimal region where it operates most efficiently if you want to maximize fuel economy. This engine region is determined by an engine's brake specific fuel consumption (BSFC). BSFC is a measurement of the amount of fuel required to produce a certain amount of power, for a given engine load and RPM. Generally speaking, BSFC is highest in high load, low RPM regions. This video will demonstrate this by conducting a test showing fuel consumption with the engine at four different operating regions, but with the same power requirement for each - to keep a car moving at 60 mph. Check out the video for full details, and to learn when the best time to shift is! Related Videos: Best Shifting For Acceleration - https://youtu.be/zZBqb0ZJSwU LSPI: Don't Lug Your Engine - https://youtu.be/soJea7xEt-8 Related Products (OBDII Data Overlay): Garmin 4K Camera Used - http://amzn.to/2fZSSQ0 Data Overlay OBD2 Link - http://amzn.to/2fZMYi3 Engineering Explained is a participant in the Amazon Influencer Program. Don't forget to check out my other pages below! Facebook: http://www.facebook.com/engineeringexplained Official Website: http://www.howdoesacarwork.com Twitter: http://www.twitter.com/jasonfenske13 Instagram: http://www.instagram.com/engineeringexplained Car Throttle: https://www.carthrottle.com/user/engineeringexplained Amazon: https://www.amazon.com/shop/engineeringexplained EE Extra: https://www.youtube.com/channel/UCsrY4q8xGPJQbQ8HPQZn6iA NEW VIDEO EVERY WEDNESDAY!

Comments

Stewart Mckinna : The best time to shift gears is when your right foot is touching the firewall and the rpm needle is sword fighting in the hotzone

Frouch Itude : For the best fuel economy, walking is pretty efficient.

Tamlin Giles : Keep revs between 1500-2000 while cruising, accelerating dont let them get above 3000.... pretty basic really

Frouch Itude : When you see the smoke, it is time.

Ashwin Mohan : Many petrolheads I know and I'm one of them, do like to do economy driving. We have a simple system where we try to get into higher gears ASAP and keep the rpm below 3000 WITHOUT lugging the engine. I have a Honda City, which can be quite comfortable even below 2000. Infact, what we are doing is exactly what Jason says. Load it as fast as we can and keep rpm low, and NEVER ever brake (unless you relly need to, cause braking is waste of fuel). Try to coast near red lights and crossings. Blasting through highways and backroads is fun when you got loads of fuel, but can get real interesting when you are low and filling stations are far. Jason explained it engineeringly, ofcourse!! Thank you for another great video.

Seth : High load low rpm = Miles per gallon High load high rpm = Smiles per gallon

Mikael Abrahamsson : In "ecodriving" courses, it's taught that in constant speed, use the highest gear where the engine runs well (not lugging). This is consistent with your advice. Now, another interesting question is what to do when you're at a stop light at standstill, and you're going to accelerate up to let's say 70-100km/h. Then the advice is actually to accelerate fairly hard to get up to speed quickly, so that you then can use higher gear for longer distance. You didn't touch on this at much (actually the title of this video would better have been "what gear to choose when driving at constant speed"), but I think it's an important topic. Some people think it's fuel efficient to slowly accelerate, but this just keeps them longer in lower gears which is not efficient. So the advice for best fuel economy is to put in quite a lot of throttle (probably in the 1500-3000rpm band you were talking about) to get yourself up to desired speed, and then choose the highest gear suitable for that speed. Then another thing for fuel economy is to avoid using the brakes. So coasting is important, if you see well ahead that you're going to have to reduce speed, get off the throttle early, and coast in gear. On petrol engines, this cuts off the fuel supply completely, so as you're coasting, you're using no fuel. This means from highway speeds you can get approximately a kilometer of "no-fuel-used". I see way too often people maintaining speed almost up until the stop light or whatever, and then get on the brakes. https://en.wikipedia.org/wiki/Energy-efficient_driving has lots of these things.

Daniel G : If you live with LA traffic and drive manual, you are already obsessive about this subject.

Monster RAM : No first gear at 60mph? ๐Ÿ˜œ

AD1 : Your test is kind of incomplete because you tested the coasting efficiency of each gear but didn't test the differences of efficiency to reach that speed under acceleration. If the goal is to reach a certain speed, it may be more efficient to do it quickly with less duration of load rather than slowly while being under throttle for a longer amount of time. I'd really like to know where the balance is.

Nishant Dash : In a nutshell: *As soon as you can without bogging*

shazeb ashique : I shift when my car asks for it, with sound.

Ri Max : You shift when the engine goes BABABABABABABA

HELENO HENZO : before the rpm bar gets to the red

O!Technology : Shift to R for "Really Efficient" mode

Phil Atkins : Basically be gentle and ride the torque :)

crazyjr : While i agree with you, there needs to be a caveat. Different engines have different power bands, Straying away from said power band too much, can ruin your mileage. I used to have a Mazda B2200 truck, 2.2 liter 5 speed, it liked to rev and averaged 25 MPG running in the 3,000-5,000 RPM power band, for acceleration. I sold that truck to my dad and he lugged it everywhere and only averaged like 18. asked me how i was hitting 25? I told him to treat it like a bike, rev it and let it run. He tossed me the keys and said, show me how you drove it. When i did, he was amazed it even got mileage, but he replicated my driving style and it instantly got 25 MPG all day every day till he got rid of it. You are right to a point, but the engine has a specific area it likes to and was designed for. if you stray too far outside that comfort zone it can hurt you both in mileage and also durability, because Spark knock is no joke, it'll ruin your engine bearings.

The_Touring Jedi : What he is trying to tell you that, when you are low on cash in your pocket you shift from 1st directly to 3rd and then 5th gear and let the car roll on it self dowhill. With this philosophy you get the best MPG. Reving your engine at low gear sucks out your bank account๐Ÿคฃ๐Ÿคฃ and thats a fact.

Imrahil : You kinda ignore something important here. Throttle setting during acceleration. You're actually using up most of your fuel accelerating, and here's where I see most people screw up. For some reason people think gentle acceleration makes for high fuel economy. Starving the engine of fuel never allowing it to get to peak efficiency...

protoslashwyl : really liked the 4 split screen with added graphics

Spark Guy : You Wasted A Lot Of Fuel Making This Video xD

Digidi4 : I'm driving from 1500 to 3000 rpm in hopes that it will give good fuel economy and it turns out that it actually does thanks

Dartheomus : Think about an RPM and what happens during that cycle. Your pistons back and forth, meaning a shift in momentum which is inefficient. (Let's minimize that!) Also, every second time the cylinder travels back and forth, you need to inject gas and burn it. (Hence more RPM = More gas burned.) So yes, it's very logical that you want your RPM low if you want fuel economy. So what is the down side? Well, technically you are working your engine harder. Think about riding a bike up a hill in low gear vs. high gear. At some point, you blow your damn knees out! :) So technically you are probably wearing out SOME of the components in your engine a bit faster, but things like piston rings should be better off because they aren't going up and down as frequently. /shrug. Overall, it's better to run low RPM unless you are racing.

Pรฉk Backer : so use 2nd gear at 60 mph, for zero engine load, saves money right?

Ben Goyette : the red dude at 6:34 had pretty good fuel efficiency

Brandon Daniels : You're the Mona Lisa Vito of YouTube ๐Ÿ˜‚๐Ÿ˜‚๐Ÿ˜‚

Skaarjman : Early as possible is not good for turbo diesels, I get better fuel economy when I shift at 2.5k - 3k rpms.

Erick Castillon : Why am I watching this? I pretty much shift near redline all the time๐Ÿ˜‚ theres no " fuel efficiency" in my driving book

Josue Martinez : who else listening to this in a 4 cil manual while driving

xonegunx : How many trips up Bogus Basin Road while filming this video? Haha, nice job! I've always wondered about this topic.

James Banks : In a turbo engine I get a bit better gas mileage if I stay in a lower gear and not use turbo boost (air fuel mixture gets way richer once you start to lug the engine at all). So if I go up a hill in 6th I get worse gas then if I stayed at higher rpm in 4th or 5th and just stay light with the throttle

Erik Haugan Aasland : I have a question that is perfect for Engineering Explained: Is it more economical to to a reasonably fast acceleration to the desired cruise speed or is it better to do it slower? The variables are interesting - the time spent accelerating being the one that springs to mind first. Hope you can make a video on this, if you haven't already. Great channel, by the way - I learn so many interesting things! :-)

Tewthpaste : *i shift when i hit the red bar because i prefer acceleration over fuel saving because it doesn't really matter in small streets. Thats why your car have the 19 mpg in city and 30 mpg on highway or so, so trying to save fuel driving in the city is as useless as trying to save fuel trying to shift early when your car is dragging. Want to save fuel? then buy a Prius.*

Assaad Helou : Hello and thank you for your videos is so good Question : is driving in Manuel transmission in traffic. Is more fuel efficient of the automatic in the (traffic)? Thank you

Military Broadcaster HD : When it says too right?

KINGatLIFE : So basically do what you already do without revving to high. Oh and coast in 5th when going down hill.

Danny Knapp : We're pretty obsessed with fuel mileage in the trucking industry. For large turbo-diesel engines and trucks, the biggest factor is speed due to aerodynamic drag. In a typical truck you lose approx 1/10 mpg for every mph over 55 you go. (It's not linear, but 1/10 is approx). Some engines prefer different rpm. A Cummins N14 likes 1400 rpm when loaded, while a Detroit 12.7 can be lugged down around 1200 or even 1100. You can get a visual clue as to what rpm might be best for your engine by looking at the torque curve data. Most truck diesel engines can be driven at very low rpms when the truck is unloaded. For loaded driving though, the key is slow acceleration, shifting at a bit above target rpm. Another trick is to ease off when going uphills and wait for downhill stretch to regain acceleration. I'm not knocking this video, it's great info. I just feel qualified to add my 2 cents because groups of truck-drivers have literally done hundreds of thousands of miles of testing, number crunching, etc... trying to get that extra 1/10 mpg. We've learned a couple things. Some of which is relevant to cars, some of which isn't.

Darzy : When you own an s2000 its 9k every gear!

SplitBean : This video just overcomplicated some so simple, still a nice explanation though

ifluro : Twice the RPM = twice the fuel used, who woulda thunk it. Can you do a test to compare low gear/light pedal with high gear/heavy pedal? For up hill travel.

iVlogBuzz : Low rpm does not mean low engine load/fuel efficiency, try this on long steep hills. People need to understand their torque curve.

Castle Bravo : Sometimes the more you try to save fuel the more you actually use. You become paranoid about using the accelerator and lift off unnecessarily, and in turn you use more fuel accelerating back up to speed again. Just drive smoothly without thrashing you car.

Dahoon : I see the car has 100 % identical dash at the speedo as an older Alfa romeo. Nice copy&paste there Subaru.

Nick CelMic : Dear Explaingineer, please tell us the same story, but about diesel cars. Do the same principles apply to a normal diesel car equipped with a manual transmission, such as a KIA Cee'd? Thank you!

Gpcas9 : Now do this with electroc motors ;-) Heard thier windings are optimized for 50km/h?

Bastian Springer : In my driving schools (Golf GTI) I'm supposed to use 1 for speeds up to 20 km/h, 2nd for 20 and up, 3rd for 30 and up, 4th for 40 and up, 5th for 50 and up, 6th for 70 and up for general driving. (which means when I'm accelerating for the Autobahn I'm supposed to go up to 95 in 3rd gear) Keep in mind: km/h, not mph. That means that at 59 mph (95km/h) I'd easily exceed the 70 km/h and should therefore use 6th gear I'd call that efficient. Btw: I'm usually at around 1800 RPM when switching up the gear

Yathu prem : 2:48 How can you do that. Talking that complicated while driving

T : Is lower engine load and higher rpm better for the health of the engine?, of course with the engine being at the right temp & the vehicle not being red lined etc.?

MultiTerpen : I am more into smiles per miles. Thats why I daily a BMW 328CI it does about 12miles per gallon...๐Ÿ˜‚