Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - " Aerodynamics doesn't begin to have an effect until 60 MPH "

ALS · 12-24-2021, 03:48 PM

I did some testing a few years ago with my 97 Volvo and speed matters with fuel economy. It weighs in at 3450 lbs and has a Cd of.36
EPA has it rated at 25 mpg highway and Euro ratings are 11.7 liters per 100km.

50 mph 35.4 mpg
55 mph 33.9 mpg
60 mph 31.15 mpg
65 mph 28.5 mpg

At 70 mph it seems to run around 25.5 mpg.

BTW this was after some undercarriage mods. Before cleaning up the air flow under the car, it would get at most around 25.0-25.5 at 65 mph with E10. With straight gas the car gets between 29.25 and 29.75 mpg at 65 mph.

12-24-2021, 03:48 PM	#50 (permalink)
ALS EcoModding Apprentice Join Date: Jun 2008 Location: Pittsburgh Posts: 116 Thanks: 0 Thanked 22 Times in 16 Posts	I did some testing a few years ago with my 97 Volvo and speed matters with fuel economy. It weighs in at 3450 lbs and has a Cd of.36 EPA has it rated at 25 mpg highway and Euro ratings are 11.7 liters per 100km. 50 mph 35.4 mpg 55 mph 33.9 mpg 60 mph 31.15 mpg 65 mph 28.5 mpg At 70 mph it seems to run around 25.5 mpg. BTW this was after some undercarriage mods. Before cleaning up the air flow under the car, it would get at most around 25.0-25.5 at 65 mph with E10. With straight gas the car gets between 29.25 and 29.75 mpg at 65 mph. Last edited by ALS; 12-24-2021 at 04:19 PM..