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I use Shell or BP, 93 octane. Not sure which is better, but I've heard good things about both. Supposedly Shell gasoline is "Nitrogen enriched." I stay away from Kroger and Walmart gasoline, even if it's cheaper. I've got no evidence to back up the fact that Shell or BP is better, but my Si is my baby. :D
^ agreed
 

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I use Shell or BP, 93 octane. Not sure which is better, but I've heard good things about both. Supposedly Shell gasoline is "Nitrogen enriched." I stay away from Kroger and Walmart gasoline, even if it's cheaper. I've got no evidence to back up the fact that Shell or BP is better, but my Si is my baby. :D
IMO and what I seen on a ultra gauge Shell produces more HP, so its more efficient at upper rpms. BP produces more torque at lower rpm which helps in mpg but still has decent power at upper rpms.

Walmart gas is a cheap gas with the government minimum on detergents but there premium is a little better. I would rather use BP or Shell.
 

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I had done a couple of tanks of 93 in my R18, and had my ecu reset before the first tank. Mileage was virtually the same as when I used 87. I'm back with 87 now, at 50 cents less per gallon than 93.
Scotty sorry to hear that it did not help your mpg put there should have been a difference big enough to say a few mpg but not enough to pay the difference in cost. I am using Walmart gas 2 tanks in extreme cold with about 2 extra hours of idling and still getting 35 plus mpg. Its colder than last year and Dec 15 starts winter gas so actually the mpg will go up because of no loss in aromatics not burning.

You R18 guys might not like premium and that is OK but its the cheapest HP and torque gain and should be your first mod. Here is some info on how it works and a 10 to 1 compression motor about our size 1.8 requires 102 Ron or higher. http://www.crcao.com/reports/recentstudies2012/CM-137-11-1b Task 2-5/CM-137-11-1b Final Report.pdf
 

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Silver, it was maybe 1 mpg difference, and it's true that I didn't give it a lot of time to prove itself, but I was biased going in, and am not comfortable paying an extra $6ish for every new full tank.
 

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Silver, it was maybe 1 mpg difference, and it's true that I didn't give it a lot of time to prove itself, but I was biased going in, and am not comfortable paying an extra $6ish for every new full tank.
Scotty, with even a 1 mpg gain it was heading to better mpg. It takes a few tanks to adjust and it improves as it sees no knock. Its been colder than normal and there is a fuel enrichment mode that applies more fuel due to the cold and the ecu will lean out but it takes time. I am getting 35 plus averaging 30 mph down 12 mph from summer so its now 60/40 city driving. 6 dollars is not accurate even if you empty the tank. Its more like 3-4 dollars which would be less and less as the ecu adjusts. I agree that even with the ecu reset and premium in the tank the ecu starts at a safe timing closer to regular and did not adjust to MBT timing but that is because it starts at a safe timing and has to relearn the operating conditions. This way the car is safe from knock during all conditions. All cars with adaptive timing start this way and as the timing advance the engine become more efficient.

I've been running premium mostly and averaging 40.8 lifetime at 10.2 cents a mile and I don't always drive conservatively. The car starts immediately and runs smoothly which means less wear so there is other benefit.

You did say you were going to try again when it warmed up so I knew you seen something you liked.
 

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Jamis, you need to explain how you get 34 in city and 44 highway. My average on 61 fill ups is 40.8 so that is about 8.8 mpg higher than Honda mixed driving which means my city mpg is 40.8 and so is my highway. Its a average that is constantly changing and getting better city mpg on average than highway. Mainly because I drive faster than the speed limit on the highway. I see about 60 mpg average on the highway with 40 in the city and the difference is idling.
 

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I don't see my car ever getting 60/40 even if I used rocket fuel. :)
 

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I don't see my car ever getting 60/40 even if I used rocket fuel. :)
LOL, I don't think there would be 60/40 left of your car if you used rocket fuel. I am just saying that mpg is a changing average based on conditions. Even in cold conditions with lots of idling I am still getting great mpg using premium gasoline and that my city mpg is just as good as my Highway.
 

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Yeah, I'll try it again come springtime. :)
 

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I've been running BP 91 and on a trip to DM 100 miles round trip at 75 mph and reset trip gauge my MPG was only 33 the air temp was 20 degrees.The frwy is I 35 north mile marker 34 to 80


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I've been running BP 91 and on a trip to DM 100 miles round trip at 75 mph and reset trip gauge my MPG was only 33 the air temp was 20 degrees.The frwy is I 35 north mile marker 34 to 80


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If I go the speed limit I don't get the best mpg. Its around 67 mph that I see the best mpg. There is 2 speed groups that get higher mpg. One is around 35-40 mph and the other is 67-70 mph.
 

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That makes sense the speed limit is 70 and for some dumb reason I think I can't drive below that^^^^^^^^^
 

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That makes sense the speed limit is 70 and for some dumb reason I think I can't drive below that^^^^^^^^^
The speed limit on the tollway is 55 mph but the average speed is 70 mph. They are going to raise the limit in Illinois on some roads to 70 mph. The problem I see is people talking on the phone because at that speed yours traveling a foot ball field in a few seconds. The other is small trucks like snow plows pick ups and school buses and lawn care with a few dump trucks. They are not set up for interstate driving and most would not pass a safety inspection and they are usually towing trailers that are rated for 45 mph. The governor of this state raised the tolls and then allowed them on the interstate which under federal laws they are not allowed but no law enforcing from the state police. Pick up truck with B plates have to follow the same rules as I do in a semi.
 

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Jamis, you need to explain how you get 34 in city and 44 highway.
Well, I'll try. Over 90% of our driving is what I consider city driving. We've done very little pure highway trips this year. Our normal drive is a 25 mile trek across town to pick up our grandkids from their school and take them to their home. Then we return by the same route to our home. The trip out is as follows:
1. 1 mile & two traffic lights to get to an interstate ramp.
2. 2 mile sprint on the expressway over an interchange to another expressway and then exit to surface streets.
3. 17 miles of street travel with traffic lights about 1 mile apart for most of the route. Speed limit 50 mph if traffic will allow.
4. 5 miles of rural road with stop signs every mile to school and then to the kids' home. Speed limit 50.
5. 30 minutes of idling in the pick up line waiting for school to let out.
6. SWMBO and I take turns driving this route. Her outbound and me inbound.
7. Outbound is usually during light traffic. Inbound is usually during rush hour.
8. SWMBO doesn't care much for MPG and tends to drive with a heavy throttle and late braking. I drive with the ambient bars and instant mpg graph in mind and coast a lot by watching traffic lights way up ahead.

If you look at my postings in the MPG thread, I'm averaging pump mileage, iMID mileage, and Navi mileage. SWMBO drove most of the last tankfull and the mileage was down some from previous tankfulls. I'm pleased with what we are getting. Everyone's driving route differs enough to alter what they get, so as long as mine is consistent, I'm happy.
 

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Thank you Jamis, but any speed over 30 mph is considered Hwy. If you can average your speed from your fastest speed. Like I drive 70 mph on the hwy with no lights for 19 miles and the rest is city. It works out the same either way 60/40 percent in the summer but seeing more idling in the winter and also engine loads are higher with lights and heat on so my mpg is actually higher in the winter when all conditions taken in consideration. So looking at you signature your are getting 6/7 mpg less than me and is confusing with no other info. It looks like you getting 35 mpg in 50/50 driving.
 

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The streets we drive on the school route may be 50 mph speed limit, but we rarely hit that speed, nor hold it for long if we do get to it. Most of this route is accelerating and braking.
 

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I'm going to clock my commute to see what types of roads and speeds I do because I get crappy mpgs, but then again, I always have.
 

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Wow I didn't know so many people pay extra for this placebo effect. I'm guessing a k&n air filter gave you all 2 more mpg also right? I've done tons of old fashioned logging and used a scan gauge in 3 generations of civics now. I guess my cars just aren't special enough to benefit from premium.

Btw the Si doesn't require premium, it recommends it. It will run fine on regular but retards the timing lowering power output. Also if the R18 can "learn" to adjust to premium then why do people with 8th gens tune their R18 to run on it? Stop spreading misinformation. The ecu will adjust to run the same as it was set from the factory no matter what you put in it unless you make it do otherwise.
K&N Filter... I got one from Amazon, put it in my Civic 2015 and I just got air flow restriction, lower MPG and lack of power... I had to put the OEM filter back... K&N lost me on that one...

I am working on 91, as long as the gasoline is good quality gasoline, the car runs fine... Sometimes I feel the gasoline is not good and feel my car like not as agile as before... I haven't tried 95, yet... I see bunch of people saying it better and another bunch saying it is as waste of money... Perhaps I have to try on my own and find out...
 

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I've never seen 95. Where do you get it?
 
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