Switch to 5w20

[talnlnky]

the first 13,000 miles on my car I ran regular 5w30 oil from the dealership, the next 8 changes I ran synthetic (usually Mobil 1 5w30). I didn't really see an increase in fuel efficiency when I made the jump to synthetic... if there was an improvement... it was within 1mpg.

For kicks, I decided to put in Mobil 1 5w20, and see if there will be a measurable difference in fuel efficiency. Between friday & monday this weekend, i'll be driving over 1000 miles, 95% highway from 55-75mph. Looks like temps will vary between 35F to 50F.

I think the biggest chance of a noticeable increase in efficiency won't be on highway driving, but actually on short trips in which the engine has to warm up from a cold state.... such as my 9.3mile commute to work in the morning.

Who knows... we'll try this very unscientific venture and see what happens.