New 2013 gas woes
Registered User
Joined: Feb 2013
Posts: 204
Likes: 21
From: Knoxville, TN
I have an 09 X coupe and average 17 to 19mpg on premium 93 octane ethanol gas. 90% highway driving at about 70 to 80mph back and forth to work.
With premium 91 octane 100% gas, that consistently improves to 20 to 24mpg after I burn off a tank of non-ethanol and refill. It costs more but my overall distance to empty is better. In the end, I think the difference in cost washes out but with the extra mileage I gain, I can get more than an extra round trip to and fro work.
David
With premium 91 octane 100% gas, that consistently improves to 20 to 24mpg after I burn off a tank of non-ethanol and refill. It costs more but my overall distance to empty is better. In the end, I think the difference in cost washes out but with the extra mileage I gain, I can get more than an extra round trip to and fro work.
David
Registered User
Joined: Feb 2013
Posts: 204
Likes: 21
From: Knoxville, TN
Hey.... where did the thanks button go? Anyway, thanks for posting this BB. Good read!
David
Registered Member
Joined: Sep 2012
Posts: 1,638
Likes: 161
From: NJ
Very true! I went from this
To 22mpg in the cold weather we've been having in NJ. Letting my vehicle warm up for a few minutes each morning so I can drive with my coat off is killing my MPG. It was 8* above this morning.
Telcoman
Registered Member
Joined: Nov 2006
Posts: 278
Likes: 13
Physics says this is 100% untrue. It's physically impossible for this to be true. Think about how combustion works and reconsider that maybe your perception isn't correct. That's like me saying I lose more weight when eating 4000 calories a day than when I eat 1500. That dog don't hunt. And the only way a car gets better mileage at 75-85 is if it's a race car that is travelling 150 mph the rest of the time. Your car gets significantly better fuel mileage driving at 50 than at 75-80. That's a fact.
I'm not saying it doesn't seem that way to you for some reason. I'm saying it's not the case in reality.
I'm not saying it doesn't seem that way to you for some reason. I'm saying it's not the case in reality.
** edit:
After reading that link about why cold reduced mileage, I noticed he left something out. While everything he mentions is true, what I would add to his list is the fact that your mass airflow sensor tells the ECM that denser and colder air is coming in, so the ECM sends more fuel to mix with it so the car won't run too rich. This makes more power but also uses more fuel.
Last edited by jmann; Feb 12, 2014 at 10:19 PM.
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