Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Hypermiling with an old BMW 523i E39 (42,8 MPG / 5,5 L/100 km)

Silent Blood · 07-14-2020, 05:19 AM

Hello there!

I would gladly like to share my hypermiling story with you.

To my person: I´m male, 37 years old, live in germany. I purchased an BMW 523i E39 (sedan, 5 - gear - manual) with an M52 engine (same as the US - 528i, just a little bit smaller, 2,5 unstead 2,8 litre) in the year 2005. The car was built 1997, and most the time I drove it with about 8,5-8,7 litres per 100 km (27,0-27,7 mpg).

A few years ago, I decided to figure out, how fuel saving it can be. I extend the rear axle around 16 percent, fill in 0W40 motor oil, and learnt how to drive very economic.

Result over about 10.000 miles: 7,0 l/100 km (33,9 mpg E10, 95 octane). Average speed: 34,7 mph (56 km/h), mix of highway ("autobahn"), village streets, and a small amount of coty driving. On single short roads, I sometimes reach a value about 5,5 l/100 km (42,8 mpg). For example: Last time I drove a 118 miles long road, from even hight of the location, to a even hight, maximum speed: 60 mph (97 km/h), average speed: 56 mph (91 km/h). On slight downhill I put out the gear, on stronger ones I use the fuel cut-off, by letting the gear in, and just put my feet off the gas pedal.

I think, this is very remarkable for a car like this. Remember, it´s 23 years old (was released in 1995), got a petrol straigth six engine, has only 5 gears, weighs with me inside 3594 pounds, has no electric steering, no direct injection, of course no brake energy recovering, no hybrid, no lean burning technology...The only thing, what´s advantageous on this car for fuel saving purposes, will be the aerodynamics (cw x A = 0,59 m²)

What do you think? Did anyone have a tip for further fuel saving experiments?

07-14-2020, 05:19 AM	#1 (permalink)
Silent Blood EcoModding Lurker Join Date: Jul 2020 Location: Germany Posts: 25 Thanks: 18 Thanked 5 Times in 4 Posts	Hypermiling with an old BMW 523i E39 (42,8 MPG / 5,5 L/100 km) Hello there! I would gladly like to share my hypermiling story with you. To my person: I´m male, 37 years old, live in germany. I purchased an BMW 523i E39 (sedan, 5 - gear - manual) with an M52 engine (same as the US - 528i, just a little bit smaller, 2,5 unstead 2,8 litre) in the year 2005. The car was built 1997, and most the time I drove it with about 8,5-8,7 litres per 100 km (27,0-27,7 mpg). A few years ago, I decided to figure out, how fuel saving it can be. I extend the rear axle around 16 percent, fill in 0W40 motor oil, and learnt how to drive very economic. Result over about 10.000 miles: 7,0 l/100 km (33,9 mpg E10, 95 octane). Average speed: 34,7 mph (56 km/h), mix of highway ("autobahn"), village streets, and a small amount of coty driving. On single short roads, I sometimes reach a value about 5,5 l/100 km (42,8 mpg). For example: Last time I drove a 118 miles long road, from even hight of the location, to a even hight, maximum speed: 60 mph (97 km/h), average speed: 56 mph (91 km/h). On slight downhill I put out the gear, on stronger ones I use the fuel cut-off, by letting the gear in, and just put my feet off the gas pedal. I think, this is very remarkable for a car like this. Remember, it´s 23 years old (was released in 1995), got a petrol straigth six engine, has only 5 gears, weighs with me inside 3594 pounds, has no electric steering, no direct injection, of course no brake energy recovering, no hybrid, no lean burning technology...The only thing, what´s advantageous on this car for fuel saving purposes, will be the aerodynamics (cw x A = 0,59 m²) What do you think? Did anyone have a tip for further fuel saving experiments? Last edited by Silent Blood; 07-15-2020 at 04:30 AM..