gas milage

northvale-PA · Jun 5, 2012

my car's gas milage went down from about 28 to 26.5 mpg, about 1 week ago. I assume that is the summer mix gas doing it. I buy Shell regular.

rufus80 · Jun 5, 2012

Is there ethanol in it? When i had to buy gas at stations that blended ethanol in their gas my mileage would go down.

northvale-PA · Jun 5, 2012

yes, but I assume it's always in the gas.

El Toro · Jun 5, 2012

If your car has AC and you're using it that will lower your mpg. Hal

ldj · Jun 5, 2012

That is only 1.5mpg. Are you filling at the same pump? Pumps have errors and pumps automatic cut offs cut off differently. So if you went to a pump that put a little more fuel before it cut off or it was reading a little too many gallons than actual. Try filling at the same pump at the same station and I'll bet you get more consistent. You are working with such a little difference that just a little off with fill up will cause that.

wisbaker · Jun 5, 2012

On more than one tank? Maybe your previous tank was short filled. Checked your tire pressure? Running A/C? driving faster? traffic jams or waiting for trains? Carrying more people or more stuff in the trunk? Cottonwoods in bloom (did you ingest a bunch of cottonwood fluff or trash in your air filter)?

David G · Jun 5, 2012

You need more than that for a trend, run a couple of tanks.

showcrop · Jun 5, 2012

Pumps that don't shutoff accurately are not legal. Read the fine print on the certification next time you fill up. They have to be tested regularly by the state.

Michael Soldan · Jun 5, 2012

Check your tire pressure,you could have one or more underinflated and that will rob you of mileage real quick.

BushogPapa · Jun 5, 2012

My '07 Taurus and my '91 Jeep Cherokee both will take gas as long as you want to stand there and tease it in....
Probably 3+ Gallons after the automatic shut-off stops it...
Rain or a change in wind direction can make more variance than that..
Windows Down..?? More Drag with them down, hurts mileage too..
Ron.

MSD · Jun 5, 2012

Here in South Dakota it is illegal to sell 85 octane. That said, western part of the state has always sold it because of a higher altitude so you could get by with it so they say. A couple of weeks ago there was an article in the paper that one distributor had been selling it in the eastern part of the state where it is not allowed. A check showed 29 stations selling it that weren't supposed to be. They even left the labels on the pump that said it was 87 octane. Some places were even selling 83. The distributor in question said everyone else was doing it so thats why he was. Gas suppliers in Wyoming told the governor that if he didn't allow it in the state, they would stop shipping to the state. Gov thinks it would be ok because we can't go without gas. Point is, you never know what the heck your putting in your tank and why your mileage drops all of a sudden.

Jon Hagen · Jun 5, 2012

Doubt it, summer blend should be less volitile and higher energy content than winter blend.

ldj · Jun 5, 2012

Don't know what law says in my state. Pumps can't shut off same. Depends how fast you have fuel running in, also how far you have nozzle stuck in tank, also the car it's self. Sooo if law dictates when a pump shuts off there would need to be a law that says how you put gas in and in which cars so that pump would have a half way chance of cutting off the same. If you never have had these factors causing pump to cut off early you need to buy extra lottery tickets this week cause you are very lucky.

MarkB_MI · Jun 6, 2012

That's five percent. Is that per the car's computer, or did you calculate based on how much gas you put in the tank? Is that the mileage for one tank of gas or the average over, say 1000 miles?

Unless you've seen the average drop over several tanks of gas, five percent isn't statistically significant.

dej(Jed) · Jun 6, 2012

I bought a $3.20 per gallon, 89 octane gasoline in SD during a recent trip and I noticed no difference in gasoline mileage. Their 87 octane was $.10 more per gallon? My 2006 Impala got between 30 and 33 mpg no matter what I put in it. Here in Pa I think they add the 10% ethanol, but give you an 87 octane which causes the mpg drop. Pa gives you no price break or octane break whatsoever.

Texasmark1 · Jun 6, 2012

I just completed a 500 mile round trip with my little Chevy 4.8, 4 door p/u, full of tools and a 8 and 15' ladder hanging out the back.....with the state required red flag. Got 20.5 in the mornings and it dropped to 19.5 4 hrs later running mostly 70-75 on the interstate, no AC on. Did it both coming and going. I guess the air heating up made it less dense so when the piston squeezed the fuel air mix, it was less dense so I got less bang for the buck so it took more bucks.

Mark

Bob N.Y. · Jun 6, 2012

My mileage always goes down in November and back up in March regardless of the weather.

36 Coupe · Jun 10, 2012

You cant get good gas milage running 70/ 75.Do you understand that gas milage can be cut in half driving that fast.

gas milage

northvale-PA

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rufus80

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northvale-PA

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El Toro

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ldj

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wisbaker

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David G

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showcrop

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Michael Soldan

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MSD

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ldj

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36 Coupe

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