Better gas better mileage?

If I were to run a higher octane fuel in my 06 would I get better mileage?
I appolgize If this has been posted a million times

 

No

 

+1

 

Sometimes the lowest octane has somewhat higher ethenol content; if that happens to be the case, yes.

If you accelerate at low rpm/high load like a hypermiler (<1800 rpm), then your ignition advance won't bomb out in the long term, and in that case yes. Similar situation if you tow a trailer.

If you want to run higher intake temps for mpg then definitely run premium.

For normal drivers, very little difference.

 

Gas is expensive enough don't waste it on high test.

 

i think that i do get better mileage but the cost is more so its just about an even trade. if i get a few more miles per tank the tank still costs more. but that said i do not feel that paying more for premium isnt worth it because i get a few more miles out of it and the truck runs a little better.

 

If I will be running largely interstate for the bulk of a given trip, then yes, I do get better milage with premiom fuel. Enough extra miles to offset the higher cost and then some. This has been the case for numerous vehicles I have owned over the years. If I am hauling or pulling a heavy load, it is an automatic with me, premium fuel.

I have calculated the better mileage on every vehicle, carburated, fuel injected, variable valve timing, overhead valve, over head cam. Premium always pays for itself in savings per mile on highway driving, less so if I am doing a lot of city driving (Very rare).

 

I started running premium in my 2.7, and noticed about 3mpg better than what it used to be, plus it runs better and seems to pull better. Only costs about 4 dollars more to fill it up than it did when I ran regular in it.

 

I notice enough of a difference when I fill up with non-ethanol premium (the only kind I can get anywhere near my normal travels)... most recent examples:

335 miles on fill-up, very shortly after the gas light came on
305 miles on fill-up, well after a 25 mile trip home from work

 

Other way 'round.

Ethanol has a base octane rating of 118. Many common OTC "octane boosters" are nothing more than ethanol or toluene.

Cheaper brands of gas will tend to push 10% because ethanol is cheap (until the government subsidies dry up), but in general, 91 is likely to contain more ethanol than 87 since ethanol is used as an octane booster.

 

That's it?

I've gone 375 and never seen my light.
Right now I'm sitting on 260 miles and it just uncovered the 1/2 tank mark.

Chevron regular.

 

Switching to a higher octane fuel does not add more hydrocarbon content or oxygen there for the engine cannot develop more power or use less of it. Unless it's forced induction or high compression you are wasting money.

 

Damn you and your four banger!!! I fill up when I'm down to about 1\8 of a tank and that gets me about 240 miles. I've only gotten slightly better mileage with higher octane fuel, not enough to offset the higher price though. My best mileage came from using pure gas but the price of that has gone so high it's not worth it.

 

You will get a few tenths MPG better, which doesn't offset the added cost of using 93. My butt tells me that you get slightly better throttle response across the full power range, but only a dyno will prove it out.

 

That's true with an older engine, but with a modern engine where the computer can advance/retard the timing on the fly the engine can develop a bit more power on high test.

 

I notice a small improvement in mileage, but nothing that can justify spending 30 cents more a gallon. You are more likely to see an improvement by changing the way you drive.

 

I buy the cheapest gas from any gas station the last tank 20.7 MPG with snow tires, winter blend gas and 10% ethanol. I usually get about 350-400 miles out of a tank. If you feel you need high test buy it from BP I understand they could use the money.

 

Funnily enough I actually did a test with my truck, filling up from 5 different gas stations. BP gave me the highest gas mileage on average. this was also the case with my last Toyota. On the other hand, my girl's Grand Prix gets best gas mileage from Hess.

Its strange, but maybe there's something in the detergents they put in the gasoline or something. Id be interested if anyone else experienced the same...

 

Does not make any difference what the engine is or how it's timed the hydrocarbon and O2 is just not there the modern engine management will only retard the timing if it detects a knock other wise it's business as usual. The only benefit with high test is at very high revs because of the flame front. So if you are going to race it only put 5 gallons of high test in an empty tank to save weight.

 

^^ I get crappy mileage on stuff from the Mobil up the road. The Mobil I used to go to always gave great mileage. Sometimes it's just the station.

I may try 87 for a few tanks again to see how things change mpg-wise. I know at full throttle on 87 my truck runs like crud over 4000 rpm and I never have figured out why.