B4ZINGA Posted September 10, 2015 Report Share Posted September 10, 2015 More often than not, high octane results in better fuel economy. However, the cost differential does not support using the higher octane as the increase in economy tends to be minimal. Lately my R/T AWD has been in the 17 range, driving four miles one way to work with plenty of stops and traffic on the way. On the highway, I can get 26-28 at 75 MPH with four adults and luggage. I rented a base SXT V6 AWD for a trip to Toronto, and at 65 MPH with just me, my suitcase for the week, and my computer bag, I got 32 MPG. dhh3 1 Quote Link to comment Share on other sites More sharing options...
Defender007 Posted September 10, 2015 Report Share Posted September 10, 2015 I still think it's a gas guzzler. No way that my pickup truck gets better gas mileage than this thing. It's not normal but Chrysler insists it is. dhh3 1 Quote Link to comment Share on other sites More sharing options...
dhh3 Posted September 10, 2015 Report Share Posted September 10, 2015 My DJ gets 2x the mileage of my 3.7 V6 Nitro. No complaints here. jkeaton 1 Quote Link to comment Share on other sites More sharing options...
bramfrank Posted September 10, 2015 Report Share Posted September 10, 2015 More often than not, high octane results in better fuel economy. However, the cost differential does not support using the higher octane as the increase in economy tends to be minimal. Nope - the only reason you would likely get better mileage with high octane fuel in an engine that doesn't require it would be that it has no ethanol, something that a dwindling number of stations provide. http://www.consumer.ftc.gov/articles/0210-paying-premium-high-octane-gasoline Quote Link to comment Share on other sites More sharing options...
Windancer Posted September 10, 2015 Report Share Posted September 10, 2015 (edited) Personally Defender007 I would have your dealer or what you consider a honest dealer look at your car because you definately should get better mileage than what yo are getting. My 2010 gets poor mileage in the city and winter but take it for a trip on the highway and I am very happy (see my earlier post). Terry Edited September 10, 2015 by Windancer jkeaton 1 Quote Link to comment Share on other sites More sharing options...
B4ZINGA Posted September 10, 2015 Report Share Posted September 10, 2015 Nope - the only reason you would likely get better mileage with high octane fuel in an engine that doesn't require it would be that it has no ethanol, something that a dwindling number of stations provide. http://www.consumer.ftc.gov/articles/0210-paying-premium-high-octane-gasoline I'm already aware of the information on that page and what octane means, and I'm sure the lack of ethanol helps (do any metropolitan stations offer ethanol-free fuel anymore?). I have seen data collected by hypermilers, people who go out of their way to eek out every millimeter they can from a gallon, and reducing the cents-per-mile cost of their car, supporting premium octane fuels performing better, though the improvement is far too small to be worth the price increase. I have seen no data supporting the claim that premium fuel results in lower economy when it isn't called for. Do you have that data to share? Quote Link to comment Share on other sites More sharing options...
bramfrank Posted September 11, 2015 Report Share Posted September 11, 2015 There have been a number of riders in a group I host on Facebook who have done extensive testing on the platform who report that in fact 10% ethanol negatively impacts mileage by about 16% and that they get about 2% lower MPG with high octane than regular, both with ethanol. Quote Link to comment Share on other sites More sharing options...
Defender007 Posted September 11, 2015 Report Share Posted September 11, 2015 Regular gas here at our stations say up to 10% ethanol, mid grade up to 5% and no ethanol in premium. Maybe I should try a few tanks with premium... Quote Link to comment Share on other sites More sharing options...
Woah322 Posted September 11, 2015 Report Share Posted September 11, 2015 Are you certain about that statement about fuel grades used in testing? Because running higher octane fuels than the system requires results in lower fuel economy . . . . . My mother bought a 15 Ford Edge, it said tested with 93 octane but nowhere did it say that it requires 93 octane for regular use, I'm going to try and find the paper that says it. I know it's Ford and this is Dodge but it's still has some similar aspects Quote Link to comment Share on other sites More sharing options...
Defender007 Posted September 11, 2015 Report Share Posted September 11, 2015 My mother bought a 15 Ford Edge, it said tested with 93 octane but nowhere did it say that it requires 93 octane for regular use, I'm going to try and find the paper that says it. I know it's Ford and this is Dodge but it's still has some similar aspects It has the EcoBoost engine doesn't it? It sounds like it I work for Ford and all EcoBoost engines would be tested with 93 only because it has a turbo jkeaton 1 Quote Link to comment Share on other sites More sharing options...
jkeaton Posted September 11, 2015 Report Share Posted September 11, 2015 If they recommend premium, it will be stated inside the gas door or on the gas cap. My Eclipse is that way. It will run on regular, but there is a sticker inside the gas door that says "Premium gas recommended". It is tuned to run best on premium from the factory. From what I've read, the ecoboost does recommend premium gas. dhh3 1 Quote Link to comment Share on other sites More sharing options...
bigtsr Posted September 19, 2015 Report Share Posted September 19, 2015 Just returned from 5 days of travel in southern Ontario Windsor and Wallaceburg with some local driving and the L/100km/mpg is still great after 4 yrs on the road. On the 401 expressway as low as 8.1L100km (29.0 US) filled up put it into Fuelly and this is what worked out to after the round trip. rolly 1 Quote Link to comment Share on other sites More sharing options...
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