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ACEL · 07-26-2020, 12:33 PM

Every year we do a road trip across a hilly country area. When I compare the mileage of the recent 2020 edition to the 2019 drive in similar conditions, I get 6,13 L/100 km in 2020 compared to 6,69 L/100 Km with a major difference.

The 2020 gas tank fill up, before and after the road trip, was till gas almost flowed out. In the 2019, the before and after fill up were to the 3rd gas pump stop leaving some play because I cannot ascertain the gas pump was the same before and after.

Still, a potential gain of 0,56 L/100 Km is interesting. That is 3,18 MPG US and 3,89 MPG Imperial. That is a 8,4 % less fuel consumed with the modifications since the 2019 trip. If I blindly apply the following :

"“The Effect of Aerodynamic Drag on Fuel Economy”
Aerodynamic drag is proportional to the square of velocity, and hence the power needed to overcome drag is proportional to the cube of velocity.
if you make a 10% reduction in aerodynamic drag your highway fuel economy will improve by approximately 5%, and your city fuel economy by approximately 2%."

Then applying this the reverse way, with a 8,4 % increase in fuel economy, I may claim at least a 16% drag reduction. That means from a Cd=0,34 to Cd=0,28. If Cd is the same as the 1999 Civic EX at Cd=0.32 than my actual Cd is 0,27 on this 1999 Acura EL.

Anyway, I am not running after Cd record figures, but after fuel economy. So any improvement in fuel economy is welcomed. The rest is for around campfire boasting stories.

07-26-2020, 12:33 PM	#31 (permalink)
ACEL Ecomodder Join Date: Mar 2020 Location: Quebec Qc Canada Posts: 52 AcuraMatata - '99 Acura EL Base 90 day: 36.82 mpg (US) Le Vehicle - '12 Dodge Gran Caravan SE 90 day: 24.27 mpg (US) Thanks: 10 Thanked 40 Times in 26 Posts	Sure improvement measured by road mileage Every year we do a road trip across a hilly country area. When I compare the mileage of the recent 2020 edition to the 2019 drive in similar conditions, I get 6,13 L/100 km in 2020 compared to 6,69 L/100 Km with a major difference. The 2020 gas tank fill up, before and after the road trip, was till gas almost flowed out. In the 2019, the before and after fill up were to the 3rd gas pump stop leaving some play because I cannot ascertain the gas pump was the same before and after. Still, a potential gain of 0,56 L/100 Km is interesting. That is 3,18 MPG US and 3,89 MPG Imperial. That is a 8,4 % less fuel consumed with the modifications since the 2019 trip. If I blindly apply the following : "“The Effect of Aerodynamic Drag on Fuel Economy” Aerodynamic drag is proportional to the square of velocity, and hence the power needed to overcome drag is proportional to the cube of velocity. if you make a 10% reduction in aerodynamic drag your highway fuel economy will improve by approximately 5%, and your city fuel economy by approximately 2%." Then applying this the reverse way, with a 8,4 % increase in fuel economy, I may claim at least a 16% drag reduction. That means from a Cd=0,34 to Cd=0,28. If Cd is the same as the 1999 Civic EX at Cd=0.32 than my actual Cd is 0,27 on this 1999 Acura EL. Anyway, I am not running after Cd record figures, but after fuel economy. So any improvement in fuel economy is welcomed. The rest is for around campfire boasting stories. __________________ Acel See many mods in detail with results on my modification thread for my 1999 Acura EL, similar to US Civic EX Facts, please, give me the facts! Theoretical knowledge is verified by empirical knowledge! Check Einstein's General Relativity Theory E=MC^2! Every few years some new astrophysics observation and data prove some of Einstein's theory predictions more than a century old.