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2010 Civic LX vs 2013 Civic EX MPG Question

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hennessy1

Golden Member
I recently purchased a new civic after my 2010 was totaled. The one thing I noticed after a few fill ups is the amount of miles I get before another fill up.

Regardless if doing this is bad for the car I did it the first time just to get a few more miles out of the tank while traveling. I topped off the 2010 civic to the point where the gas was all the way to the top of the tank. I applied the same amount of gas to the new 2012 civic.

With either case in the 2010 I got about 400-450 miles out of a tank of gas. With the 2012 no matter if the eco option is on or off I get about 380. I know they are different trims and have different options but is this something I should be concerned with or is it just par for the course for the 2013 ex?

I am a complete novice at automobiles and am open to any suggestions. I purchased this car in August of this year. I haven't even been through my first oil change and have about 4k for miles on it.

I appreciate any direction or help you can provide thank you.
 
What is the size of the gas tank on both cars? What is the reserve? How many gallons can you add after the light comes on?

I wouldn't fill a tank up past when the fuel nozzle shuts off personally.
 
13.2 gallons on both. Sorry not sure what you mean by reserve. I would have to pay attention next time on how many I can add. I know what you mean about the filling up past the shutoff just kinda got used to an extra 100miles sometime.
 
I think the trim does make a difference. EX is heavier. That and the fact that you're using winter gas + colder weather.
 
Could even be something as simple as the tires or maybe the programming of the transmission. There are lots of variables to consider.
 
I had thought of the trim thing as well. The tires are definitly different. I just didnt know if it is somthing I should activly invest time into finding out or even worrying about.
 
in the end the best to do something like this is miles driven divided gallons filled. But since you didn't do this with the 2010 it has no bearing now. But maybe for the next car.

Also some people say after they drive your new car X amount of miles the MPG goes up because things wear in. I dont believe it but i never bought a car with next to no miles to actually test the idea.

Also you gotta think gearing might be diffrent, back in the older days the LX and EX differences were engines with and without vtec and the LX almost always got better MPG, but this is like 98 models.

pretty much its not apples to apples here. Be happy it only takes you 13 gals to drive 380miles. Im stuck with a 300 miles on 18 gallons but mines paid off.
 
Don't top off!! You're flooding your evap system. You will damage the car by topping off. This practice should have ended in the early 1990s.
 
Meh. I've been doing it for the last 15 years without any issues. Maybe Japanese cars are designed to be more idiot proof 😛
 
nerp said:
Don't top off!! You're flooding your evap system. You will damage the car by topping off. This practice should have ended in the early 1990s.
Click to expand...

There are vents now. So most cases you are wasting money cause it will spill out in the end. Or replace your canister.
 
It's generally a bad idea to top off for the reason that you can poison your charcoal canister from having too much fuel. I do top off occasionally to the fill nozzle if I'm doing fuel calculations much like OP is doing.

As for the MPG, only thing I can suggest is add a few PSI to your tires. Keep in mind it's winter time and if you're comparing the MPG of your Civic from Summer to the MPG of a Civic in Winter, it's not a fair comparison due to fuel formulations and colder weather. After about 10K miles and 2 oil changes, you should be able to get a good idea of the kind of MPG your car will be getting. Your MPG isn't especially bad so it's not like it's recall/lemon law worthy but just keep an eye on things to see if your MPG gets significantly worse or you start burning oil in a hurry.
 
I never did the top off until the first car trip to VA. When I did that and got an extra 200miles which wasn't bad.

I checked the tires they are fine. Like I mentioned this has been the same since I got the car in August so the weather factor I took out.

I figured it was the change in tires and trim that might be causing it.
 
What tire size and also brand tire?
Wider tires and also LRR vs non-LRR could have something to do with it as well.

Also how many miles on the new car? New cars seem to get less gas mileage till they are broken in.
 
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