Sudden Drop in Fuel Economy After Service - Ethanol additive in fuel?????

[yardman 49]

As I've seen mentioned in other threads, overfilling the engine oil will cause a significant drop in mpg. It should not be above the "full" line, from what I understand

[Walker1]

To All: I upped the tire pressure to 44 lbs. front & 42 lbs. rear tires with NO difference in handling. I live in a very flat area. I will post on any milege change on both Prius's.

[zonie911]

Originally Posted by snowbird

All the gas stations near me are adding ethanol now. Does the type of gas make a difference? BP is pushing their "invigorate" but I notice its not a "Top Tier" company. Others swear by Mobile. any opinions?

I hate that they add ethanol to gas!!!
It certainly does affect mpg.

[Mike Colwell]

Originally Posted by hycamguy07

1) Air conditioning - which they said can cause a 5mpg drop, except I rarely use it, so it's not that.

The A/C isnt connected to the motor its electric... I could see this on a standard A/C unit on a non-hybrid vehicle...

The mileage drop wouldnt be that much on a Hybrid...

A/C does have a significant impact on fuel economy, due to it's drain on the battery (very strong), and the engine having to run much longer to keep it all charged up. Mine drops significantly with a/c (or defrost, for that matter). Ethanol 10% will have an effect, roughly 5-10% drop.
Mike