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Fuel System All Fuel Discussions. MPG - Mileage - Fuel System Maintenance including Air Filter Replacement.


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  #1  
Old 02-23-2011, 06:00 PM
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Default Got great MPGs on recent trip!

Monday, my son and I left Marietta, OH at 12:30 in my 06 1500 and started for Mansfield, OH to look at a Dakota he was intrested in. I had driven the truck back and forth to work fri, sat, sun on that tank besides the Mansfield trip. I gassed up leaving Mansfield and got 16.8 mpgs at the pump. I reset the computer and started home (in a blizzard) I drove 20-40 MPH in 4x4 for at least an hr. before I could get onto a 4 lane road. The 4 lane was no better. I looked at the computer read out and was showing 16.5 mpgs in 4x4. After a while I switched back to 4x2. We drove to Caldwell, OH before I got back onto clear roads. It was well after 12:00 before I got home. When I pulled onto our road, the computer read out was reading 18 mpgs. I have a phone pic of it at 17.8 I'll post sometime. I was very pleased with those results. I have been running 92 in my tank and I think I'll keep it up. Just thought I'd share and offer the suggestion that you try the higher octane gas since they put ethanol in it now. I suspect that the ethanol lowers the octane in the gas by being a low temp burner. Anyway, I now know that it's capable of decent mpgs and I'm a happy camper.
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  #2  
Old 02-23-2011, 06:20 PM
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Wow thats pretty good mpg's right there. What did your son think about the Dakota
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Old 02-23-2011, 07:06 PM
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Quote:
Originally Posted by wedgeheaded View Post
I suspect that the ethanol lowers the octane in the gas by being a low temp burner.
By law, if the pump says the fuel is a certain octane, it has to be that octane or better. Also, adding ethanol increases the octane rating of fuel. The reason you get worse mileage with fuels containing ethanol is because ethanol has a lower stoichiometric ratio than "gas", and the o2 sensor detects this and will increase your fuel consumption to get your ratio closer to ideal.

Ethanol also has a lower energy yield so you will find yourself using more throttle.
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Old 02-23-2011, 09:14 PM
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Ethanol sucks! I heard if you have an older vehicle like mine, the ethanol is actually bad for your vehicle... anyone know if this is true or not? All the fuel where i live is atleast 10% Ethanol, i ran it in my escort once, when they first started doing it, and it ran like poop! I havent noticed any difference in my truck.
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Old 02-23-2011, 10:07 PM
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Originally Posted by Ram50Man View Post
Ethanol sucks! I heard if you have an older vehicle like mine, the ethanol is actually bad for your vehicle... anyone know if this is true or not? All the fuel where i live is atleast 10% Ethanol, i ran it in my escort once, when they first started doing it, and it ran like poop! I havent noticed any difference in my truck.
Currently, the ethanol limit for "gasoline" is 10%. The EPA wants to raise it to 15%. 10% has been allowed since 1979, so automanufactures have been designing around this. You should have no problems.
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Old 02-23-2011, 10:15 PM
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ahh ok good. I was worried about that cause i have a 89, but i should be fine then.
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Old 02-23-2011, 10:19 PM
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Its true you do gain mpg with higher octane... but really running even 91 over 87 for me the mpg gain is just not enough to make it worth while. mid grade is about 1.25+ a litre here 87 is now 1.19 which is roughly 4.50 a gallon.
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Old 02-24-2011, 12:12 AM
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i got some freak mileage today too!.

now i have a huge full crew cab (or quad.. ive heard em called both ways) and its 4x4. i have been averaging 13-15 city and 15 highway. i ONCE got 16.7 mpg as my best ever. i filled up today with 90oct premium. only choice was 86 or 90. i went out to my buddys house 30 miles away and i was kinda drafting him out there. i noticed right off my truck was different cuz the mds was kicking in more and staying on longer. i saw that and looked at the mpg's and was amazed to see 17.4... but thats not all. i kept a close eye on it, and as we pulled into his hometown it was an astonishing (for me) 19.8mpg! i thought maybe it was all just cuz i was drafting him, but on way back alone it only dropped to 19.2... i had a good day lol
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Old 02-24-2011, 12:24 AM
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i am usually getting 17.2 on my '09, on flat land no cross or headwinds, doing 73 MPH, 6,300 pounds

i have seen 21 one time in Texas in July 2010, truck weight was 6,000 pounds, w/ me in it.
My work sign was removed & i didn't have my rotating lights & work map books in the truck

i have 40,000 miles on it now, had it tuned up 7,000 miles ago
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Old 02-24-2011, 06:24 AM
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Quote:
Originally Posted by cudase View Post
By law, if the pump says the fuel is a certain octane, it has to be that octane or better. Also, adding ethanol increases the octane rating of fuel. The reason you get worse mileage with fuels containing ethanol is because ethanol has a lower stoichiometric ratio than "gas", and the o2 sensor detects this and will increase your fuel consumption to get your ratio closer to ideal.

Ethanol also has a lower energy yield so you will find yourself using more throttle.
maybe this is true where you live, but in jersey its +/- 2 for octane levels.
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