SO I've noticed this big beautiful beast I have sitting out in my parking lot isn't the most aerodynamic nor is it the most gas friendly. I was curious if anybody had any suggestions on helping out with the old mpg. I'd like to stay away from the after market intakes or ehaust systems seeing as how I only have 900 miles on it. I know little things help though. I've only ever dealt with gas sipping rice burners before this other than my jeep.
you need to let the engine break in, around 6000 miles or so you will start to get better mileage, it took mine about 10000km to start getting good mileage.
once you reach that mileage then you can look at putting in a drop in K&N filter and doing the airbox mod, besides that drive reasonable and you should get good mileage, but remember this is an X not a civic so dont expect high numbers, 18-20 on average
i get 14.6l / 100 km in the city which is what the sticker claimed
Remember driving around town to be easy on the gas pedal and watch your highway speed. My 11' gets noticeably worse economy above 55-60 mph. I have always had the habit of putting the trans in neutral at lights too. I can manage 18.5 to 19 mpg mixed driving mostly around town. My X has almost 15K on it now and it has improved since new.
Your mileage will be slightly better after break-in period, but not a lot. I average right around 17 and I do mainly highway driving. I have stock intake and stock exhaust. If you can keep your foot out of it, an air intake and exhaust may get you better mileage. I would recommend a Volant over a K&N though, as the Volant is a dry filter where as a K&N is oiled. If done improperly, the K&N can cause issues. Also, I would recommend the ScanGauge over the UltraGauge. It is well documented that the Ultragauge causes some weird issues to pop up in 2nd Gens. Good luck!
Best thing you could do though is add a K&N filter. Will help it breath a little better.
I forget where I found it now, but I saw a *small* study done by a university (in partnership with the EPA) studying MPG and how routine maintenance items impact it.
They actually found that a older, dirtier air filter, while causing a decrease in HP, actually caused an increase in MPG vs a new clean or after market air filter.
I recall one of the cars was a GM V6 (like a LeSabre motor or something) and one IIRC was a Toyota but I can't recall if it was the V8 or a 4 banger.
There was only 2 or 3 cars, so it was a really really small sample size and there wasn't say two of each car, just the one so who knows how it would have turned out if you expanded the study, but it was interesting none the less
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