I used to say that all the time too...but then i actually tried it and found otherwise.

I ran nothing but 93 octane for 5 years with the car. I made the switch 4 months ago to 89 octane after accidentally filling my tank with it and then discovering i didn't feel any difference.

So i decided to do a comparison. My car basically lives at highway speed. 95% or more of my driving is on a highway. I chart my MPG all the time considering my commute is nearly 50 miles each way trying to find the best route to take, vs traffic, speed, etc. So i started charting my mileage with the 89 octane. I've noticed 0 difference in MPG using 89 octane vs when i ran 93 octane for the first 5 years I owned the car. I fully intend to switch back to 93 octane and compare again, but i really don't think i'll see a difference. We will see.

I actually think i noticed more of a difference bumping my tire pressure up to 35psi vs 32 psi vs the switch from 93 to 89 octane.

But these are my results for my driving style. Guys who drive around aggressively might not notice the same as me. I drive like a grandma on the highway

 

I have no idea how you guys get such good gas mileage. This car is rated for 18 city/24 highway (5AT) according to the government ratings, and that's pretty much right in line with what I get. I average around 21-22.

 

I also get around 20MPG which is normal for this vehicle.

 

Been getting about 15 to 16mpg for the last 8 yrs. Already used to it.

 

this is why i got a cheap azz S14 to daily.

and getting a cheap azz S14 is why I got a check engine light 6 days after buying it.

**** me

its good on gas though. i mix 87 octane with 91 octane and it adds up to 178 octane. which gives me like 90mpg. 100mpg if i put some octane booster to take it up to 200 octane.

nomsayin

 

^^ hardcore.

 

Can someone tell me how do you Know how much mpg your getting if you dont have the navigation? Do you just guess it based on the gas needle. Every time I fill up I reset the trip needle.

 

i think our car has 17 gallons until it hits reserve. So, yes. Fill up, drive until at E, divide by miles 17...(i think)

 

No. You take the number of miles driven (250) and divide by the number of gallons added (16). 250/16 - 15.63. Your mpg.

To be the most accurate you need to fill up at the same station and pump and only full till the pump shuts off the first time.

 

Your computer doesn't read accurately to start with, before you get into anything at all, you need to calculate it properly.

Fill tank. Note the point when you stop filling.
Reset your Trip odometer.
Drive for at least 200 miles, or until close to empty, doesn't matter a whole lot.
Return to the same pump you filled up at, get the same gas.
Fill to the same point as before.
Write down the Miles you travelled (trip)
Write down the Gallons you put in the car just now.

Divide Miles traveled by Gallons (Miles/Gallon)
This will equal the mileage you got during your last trip accurately as long as you have the correct tire size on the car.

 

I always put 10 gallons in right at 1/4 of a tank. My trip reads about 210 miles by the time I have to do this again. 210/10 = 21mpg (sometimes a little higher, sometimes a little lower depending on if I do more city driving).

 

It's not abnormal for these cars to get that kind of mileage. My suggestion would be to change your air filter and change all of your fluid (probably won't help your mileage but I definitely recommend it for a recent purchase) and try to use your brakes as little as possible or coast more. It also depends on how long your trips are and if your car has time to warm up.

 

If he's actuallyg etting that poor of fuel mileage he probably has a vacuum leak.

 

but why would he have a vacuum in his car in the first place.