Latest data. There was a 70% highway trip at 31 mpg that I didn't include.
This time I changed from 90% sportshift to 90% Drive. I don't think RPM ever
went over 3500. The one thing that didn't change was cruising speed.
I tend to stay 5 over limit, nothing I can do about that. What changed
significantly was acceleration, I just feathered it.
This test also includes tire inflation change from 26 to 31.
The major characteristic about the amsoil is the low end smoothness and torque. Redline also improved there but asmoil did it with more mpg.
Our 2004 accord LX is rough below 2.5k rpm, trying the cheap 5-20 XL amsoil
there.
The horizontal lines are 3 standard deviations.

This time I changed from 90% sportshift to 90% Drive. I don't think RPM ever
went over 3500. The one thing that didn't change was cruising speed.
I tend to stay 5 over limit, nothing I can do about that. What changed
significantly was acceleration, I just feathered it.
This test also includes tire inflation change from 26 to 31.
The major characteristic about the amsoil is the low end smoothness and torque. Redline also improved there but asmoil did it with more mpg.
Our 2004 accord LX is rough below 2.5k rpm, trying the cheap 5-20 XL amsoil
there.
The horizontal lines are 3 standard deviations.

Advanced
You guy's should go to www.bobistheoilguy.com.
Redline has the lowest coefficient of friction among any synthetic oil. Improving gas mileage has more to do with cold morning starts or when the engine is warming up so using a 0w oil vs a 5w oil is not an apples to apples comparison. Look and compare the viscosities @ 40C. You will see that the Amsoil is lower, meaning it's thinner upon start up and this is where you'll find a big % in fuel savings believe it or not. Redline formulates their oils for maximum high temperature protection which is why they dominate road racing. They also use a Polyolester basestock, with a good 500ppm of Molybdenum. Amsoil is a PAO + Ester based oil much like Mobil 1. All 3 are excellent. One important number to look for is High Temperature / High Shear. Redline has the highest among all the oils. Amsoil is a good oil but it also tends to thicken quite a bit from the used oil analysis over at bobistheoilguy.
Redline has the lowest coefficient of friction among any synthetic oil. Improving gas mileage has more to do with cold morning starts or when the engine is warming up so using a 0w oil vs a 5w oil is not an apples to apples comparison. Look and compare the viscosities @ 40C. You will see that the Amsoil is lower, meaning it's thinner upon start up and this is where you'll find a big % in fuel savings believe it or not. Redline formulates their oils for maximum high temperature protection which is why they dominate road racing. They also use a Polyolester basestock, with a good 500ppm of Molybdenum. Amsoil is a PAO + Ester based oil much like Mobil 1. All 3 are excellent. One important number to look for is High Temperature / High Shear. Redline has the highest among all the oils. Amsoil is a good oil but it also tends to thicken quite a bit from the used oil analysis over at bobistheoilguy.