MPG increase by switching to synthetic oil
 

My TCH has more than 7,000 miles now (they grow up so fast). At my first oil change, I switched to Mobil 1 synthetic oil.

I just finished a spreadsheet to compare mileage before vs. after synthetic, and will continue to compare as I add new tanks.

The MPG gains with synthetic oil seem to be impressive. I discarded the first two tanks of data after the oil change, because the dealer had lowered my tire pressures to 30 PSI or below, when I had been running 40+ PSI.

When I compare my tanks BEFORE switching oil to my tanks AFTER switching, there is a 8.15 percent gain in MPG using synthetic oil. Will keep you posted on whether this significant gain may continue over time. So far, I'm liking it. :angel:

Regular oil: 36.2 MPG average; synthetic oil: 39.1 MPG average. YMMV.

Re: MPG increase since switching to synthetic oil
 

We noticed a MPG gain as well. However, it may be attributed to general break-in or running the A/C less now that it is starting to get cooler. Any chance that these may be factors Steve?

Re: MPG increase since switching to synthetic oil
 

I use my A/C 100% of the time, and the change was instantaneous rather than gradual. I tend to think it's the oil. Will keep checking...

Re: MPG increase since switching to synthetic oil
 

I calculate a 9.27% improvement in FE just by wearing black socks. YMMV.

Re: MPG increase since switching to synthetic oil
 

My wife is reporting that she has gone from 37 before oil change to 41 now. We have about 2500 miles on the car and just got the oil change.
All in commuter driving from Town to the suburbs.

In any case, I'm durn impressed!!

Re: MPG increase since switching to synthetic oil
 

Scooters, you didn't mention if your oil change was from regular to synthetic ...?

Re: MPG increase since switching to synthetic oil
 

If Toyota is filling our new TCHs with synthetic oil from the factory, there must be another explanation for my sudden boost in mileage. Hmmmm. In the words of Emily Litella, "Never mind."

Re: MPG increase since switching to synthetic oil
 

I was told by the general manager at my dealership to leave the original oil in for the full 5,000 miles because it was a special Toyota blend. Might mean synthetic.

Re: MPG increase since switching to synthetic oil
 

Schmedtj. A useless statistic unless you tell us what color socks you were wearing prior to your fuel increase.;)

Re: MPG increase since switching to synthetic oil
 

My appologies. Previously I would wear one red and one brown sock on a regular basis. :P