First I'll give a little background. My car is a 2011 Sonata with a manual transmission and I am a stickler for fuel economy. I have an Ultra-gauge and keep meticulous records on OCI mpg, tank mpg and trip mpg. Every trip to and from work I collect data on the temp, baro, map, intake temp, coolant temp, oil temp, wind direction, miles and fuel used. I drive the same route to and from work to keep it as consistent as possible.
I have used M1 5w20 and 10w30, VV5w20, RP5w20, PU5w20/10w30, PYB10w30 and currently PYB5w20.
My record tank with anything other than PYB was 41.25 mpg and that was pretty much all highway. Then last spring I used PYB10w30 and figured I might see a drop in MPG and at first I could not see a difference. Then on the second tank (guessing the oil had sheared some in hindsight) I started seeing all my records fall, in combined driving. Highest miles per tank, most tanks in a row (at 43.5 mpg) and the highest mpg by OCI by 2.7 mpg.
Last September, figuring the heavier oil did not hurt, I did a 50/50 mixture of PU5w20 and 10w30. Immediately I saw my MPG plummet to a high of 40.8 and a low of 38.8 mpg.
Average over that OCI was 40.1 vs 42.8 with the PYB10w30.
For this OCI I decided to try the PYB 5w20 and it quickly made a difference.
My data says my average with the PU was 38.5 mpg on a day with temps ranging from 50-59f and the last couple of weeks with similar temps with the PYB my average is back up to 42 mpg.
I have data points from 25f up to 90f and in the past year you can tell which oil is used when just from how much better it is. Upon putting the PU in and taking the hit on mpg, I initially thought it was just the onset of cooler temps but that was not the case at all according to the data.
Now, I posted on a thread in which the OP, Tribosessive I think is his user name, had posted his claims on 10.3% higher mpg with Eneos 0w20 and many, including yours truly, pretty much said he was full of it.
I was going to PM him to offer an apology but he doesn't accept them, so, Tribo, I'm sorry for my participation in saying your results weren't possible.
My unintentional results were not due to his challenge, but now I can see that it's possible.
I have used M1 5w20 and 10w30, VV5w20, RP5w20, PU5w20/10w30, PYB10w30 and currently PYB5w20.
My record tank with anything other than PYB was 41.25 mpg and that was pretty much all highway. Then last spring I used PYB10w30 and figured I might see a drop in MPG and at first I could not see a difference. Then on the second tank (guessing the oil had sheared some in hindsight) I started seeing all my records fall, in combined driving. Highest miles per tank, most tanks in a row (at 43.5 mpg) and the highest mpg by OCI by 2.7 mpg.
Last September, figuring the heavier oil did not hurt, I did a 50/50 mixture of PU5w20 and 10w30. Immediately I saw my MPG plummet to a high of 40.8 and a low of 38.8 mpg.
Average over that OCI was 40.1 vs 42.8 with the PYB10w30.
For this OCI I decided to try the PYB 5w20 and it quickly made a difference.
My data says my average with the PU was 38.5 mpg on a day with temps ranging from 50-59f and the last couple of weeks with similar temps with the PYB my average is back up to 42 mpg.
I have data points from 25f up to 90f and in the past year you can tell which oil is used when just from how much better it is. Upon putting the PU in and taking the hit on mpg, I initially thought it was just the onset of cooler temps but that was not the case at all according to the data.
Now, I posted on a thread in which the OP, Tribosessive I think is his user name, had posted his claims on 10.3% higher mpg with Eneos 0w20 and many, including yours truly, pretty much said he was full of it.
I was going to PM him to offer an apology but he doesn't accept them, so, Tribo, I'm sorry for my participation in saying your results weren't possible.
My unintentional results were not due to his challenge, but now I can see that it's possible.
