From 650+ km/tank to 460km

[caineroad]

Originally Posted by WeeYari

^ there is a recent thread here discussing the age old question of any benefit to using premium. In that thread, another tangent developed which discussed effects of ethanol on mpg.

The forgone conclusion is that ethanol does not have a negative effect. I had the opportunity last summer to run ethanol free gas while on vacation. My own mpg calculations showed zero difference.

where is that thread and any scientific backup?

this is from a government website about reduced mpg with ethanol:
http://www.eia.gov/tools/faqs/faq.cfm?id=27&t=4

[jcboy]

+1 ^^^

Ethanol gives out less energy than gas equating to less power thus less mileage. I dont know why u didnt notice a difference other than the possibilty that u just stay idle on ur car so it only drives the aircon.

Seriously man, im not kidding.

[edmscan]

I have noted a 20% decrease in fuel economy for my Yaris since the start of "colder weather". I don't expect to see this decrease change until the end of the winter weather. Hopefully in spring I will get back to my normal mileage. Btw .. I was experiencing about 650 km per tank in the summer time and now it is about 520 km during the colder weather, so similar to the mileage decrease noted by the OP.

[WeeYari]

Originally Posted by jcboy

I dont know why u didnt notice a difference other than the possibilty that u just stay idle on ur car so it only drives the aircon.

Seriously man, im not kidding.

I was ecstatic with the thoughts of running ethanol free gas. Expected clearly visible, near earth shattering improvements. Not.

All I can say is, with my mpg logged with each and every one of 297 consecutive fill-ups since I took ownership of my car, the instances where ethanol free were used did not differ from fuel with ethanol added.

Power should only be 'necessary' during take-off and hill climbing. Once the vehicle is rolling, you essentially only need enough to maintain momentum. At this point, the lower power in ethanol gas would be negligable in its impact on f/e.

[caineroad]

Originally Posted by WeeYari

I was ecstatic with the thoughts of running ethanol free gas. Expected clearly visible, near earth shattering improvements. Not.

All I can say is, with my mpg logged with each and every one of 297 consecutive fill-ups since I took ownership of my car, the instances where ethanol free were used did not differ from fuel with ethanol added.

This doesn't apply to everyone

[edmscan]

Originally Posted by WeeYari

I was ecstatic with the thoughts of running ethanol free gas. Expected clearly visible, near earth shattering improvements. Not.

All I can say is, with my mpg logged with each and every one of 297 consecutive fill-ups since I took ownership of my car, the instances where ethanol free were used did not differ from fuel with ethanol added.

I also tried Ethanol free gas in my Yaris. The conclusion .. there was NO difference in fuel economy detected. The only place I noticed a difference was my wallet as it was more expensive.

[matti]

Originally Posted by edmscan

I have noted a 20% decrease in fuel economy for my Yaris since the start of "colder weather". I don't expect to see this decrease change until the end of the winter weather. Hopefully in spring I will get back to my normal mileage. Btw .. I was experiencing about 650 km per tank in the summer time and now it is about 520 km during the colder weather, so similar to the mileage decrease noted by the OP.

I've also seen an approximately 20% drop in fuel economy in the past month or so. My last car (Corolla) had a similar reduction in cold weather.

[allyart]

in my place (jakarta,indonesia) getting a 12km for 1litre is very good, considering the traffic jam around here

[Viperoni]

Originally Posted by WeeYari

Power should only be 'necessary' during take-off and hill climbing. Once the vehicle is rolling, you essentially only need enough to maintain momentum. At this point, the lower power in ethanol gas would be negligable in its impact on f/e.

That's not the way it works.

When ethanol is substituted into the fuel, it reduces the amount of energy in the fuel - so there's less energy in the fuel.
That translates into less energy per unit volume in the fuel and less overall energy in the entire tank of gas.
You *should* see a difference in gas consumption.

I know I drop down from ~500km per tank (40L fillup) to ~450km per tank once winter fuel starts getting supplied at the pumps.

[Bluevitz-rs]

^x2

Though my millage is higher per tank, the drop is about the same. 650-700 in the summer and 550-650 in the winter. It really depends on how many short trips I make and the temp.

[edmscan]

My last 2 fill ups (partial fill ups) have been about 7.3 L/100 KM or 32 US MPG as compared to 40 US MPG during the summer time. So .. there seems to be some consistency here. It is 100% city driving with no highway driving.

Looks like my fuelly is sure taking a hit during the winter time.

[jayeh]

Originally Posted by edmscan

My last 2 fill ups (partial fill ups) have been about 7.3 L/100 KM or 32 US MPG as compared to 40 US MPG during the summer time. So .. there seems to be some consistency here. It is 100% city driving with no highway driving.

Looks like my fuelly is sure taking a hit during the winter time.

I'm glad I'm not the only one. My MPG dropped quite a bit and when I switched my snow tires from the very very heavy generic steelies to a set of toyota steelies that were about half the weight. My last tank was only 30 mpg!

Now it's sitting at about 33.5mpg on this tank according to the scan gauge.