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145k on my 2018 Si. Overall it's generally been a champ so far.

I just went through a full injector replacement in July due to one of them suddenly having intermittent misfires. That seems to be such a common occurrence among civic owners though that I'd have a hard time identifying 87 octane gasoline as the culprit. From what I understand it's more of an...

I pretty much ran 87 octane consistently in my Si for a couple of years and aside from a slight drop in mpg per tank, didn't see much difference. It's strictly a commuter car so I don't push it other than from a random stop light. Over 133K miles and 3,430 gallons of gas my lifetime average...

Had one of mine go bad @ 132K miles at the end of June. Waited a little over 4 weeks for a replacement set to come it at the dealer. Dealer was 1,156 in line on the back order list in early July. Got my car back in early August.

Never take my cars to dealers for work but this time worked out... Dealer calls me yesterday and it turns out injectors are on back order and we are number 1156 in line. Apparently they have 651 sets so we are so far out they we are waiting for them to manufacture more. I asked them what's...

After the dealer has had my car for a week they finally diagnosed it to a bad injector on cylinder 2. They were getting misfire codes P0302 for cylinder 2. I brought up the warranty extension (Service Bulletin #19-038) and they told me it doesn't apply because according to the flow chart they...

2018 Si w/ 132K miles. Just had this start happening to me a few weeks ago. Turned off the car and it was fine, started it back up an hour later and I got brake hold system problem power steering system (EPS) problem vehicle stability assist (VSA) problem hill start assist problem emissions...

I can share maybe a slightly better experiences with my '18 Si at 104K miles. Daily driver, not tuned, regular oil/filter changes, 2nd set of tires and 3rd set of rear brakes (had issues there). I don't run the AC in the summer so I'm not sure it even works, lol, although it seems to work...

I just took mine off a week ago as it's bent up and a chunk of it is missing. Hoping to run without it. Every time I took it to get the oil changed they could NEVER manage to get it back on correctly. Had it fall down on me at 75 mph and catch on the pavement and tear a chunk off once, and...

I put on about 740 miles per week during a normal work week on my Si and it's been a champ. Running 88 octane and cruise control set to 71 mph and so far the lifetime average over 103K miles is 39 mpg... typically mid 30 mpg's in the winter with snow tires on and mid 40 mpg's in the summer. :)

Just rolled over 97,000 miles the other day on my '18 Si. Due to covid and the opportunity to work from home the last 1.5 years I've been able to keep the mileage lower than it would have been at this time.

I've never found a way. :-( Such a simple oversight if they've really left it out.

Never did get it fixed, figured that would be a warranty issue and I had long since gone past that. I didn't hear it at all this year.

I've got one of these in each of my cars and have used them all multiple times, pretty slick. https://www.amazon.com/gp/product/B015TKUPIC/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

What year civic: 2018 Civic Si Average MPG: 39 mpg Mostly highway/city/mixed: Highway Which octane gas do you use: 87 Engine Modifications: K&M filter and a HFP sticker on the side of the car Driving Habit: slow and easy up to 71 mph and then hit the cruise control

On a single drive has been as high as 50 mpg. My best full tank of gas average was 46 mpg. Average over the 94K miles is 39 mpg.

I honestly wouldn't know if I'm having any carbon building issues. I wouldn't think so as I get it up to operating temp pretty quickly and then keep it there for about an hour during my drive to work. Generally, I fill it with gas, change the oil when the reminder comes on, keep the tires...

90k+ miles (145k km) on my 2018 Si.

I use Andriod Auto to listen to and respond to messages coming through my phone, much more useful than the way Honda does it. I also have VLC installed which is an AA friendly app and use that to listen to music stored on my phone. Just set up some playlists, start up VLC from within AA and...

Over 260 tanks of gas in a little over 2.5 years and tracking every one yes I can say that during the summer months I get in the mid 40's mpg. Never said I conseratively get 46 mpg. The first summer I had the car I used 91 octane and squeezed out maybe 3 more mpg. Last summer I used 87 octane...