Quote:
Originally Posted by Krieg
Have you noticed much of a FE improvement since the switch?
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I don't have good mpg data prior to the 5W20 oil, although it's been in the family for all 133,000 miles, mostly driven by my kids who have grown up and moved on to their own cars so it's back to me.
Personally I would be very surprised if 5W20 made a difference big enough to measure accurately without a chassis dyno and controlled environment.
The last 8 tanks (approx 330 miles each) have ranged from 33 to 36 mpg (it's an automatic). Using the AC is a much bigger variable on FE for a small engine car I believe.
Back in May there were days when I used no AC, then in June, AC on the way from work, now in July AC both morning and afternoon.
I always cringe when I see somebody on the net write "I put in XXX oil and got 2 mpg more"
I guarantee that any auto company would do that tomorrow if they could prove it on the EPA test.