Quote:
Originally Posted by westb87
This car hasn't once seen 80. The highest it's gone is 65, but I keep it usually around 60 max. On average I'm doing 40-60 during my commute. I see about 29-31mpg with cruise set at 60.
As far as maintenance, I've performed the following:
-Flushed/changed coolant, rad cap, thermostat (180*)
-Changed transmission fluid 3X, each time about 100 miles apart, and replaced with Mobil1 Synth ATF
-Did the same to power steering fluid, replaced with Prestone Synth Asian Formula PS fluid
-Tires at sidewall max +5psi
-Full brake job including new drums, rotors, shoes, pads, lines, hardware and all sliding/contact points and pins properly lubricated.
-Spark plugs removed, cleaned, regapped to .044 per manual
-New cabin air filter
-Haven't changed air intake filter yet because the one in the car was still white and was supposed to have been recently changed, per the receipt from sister-in-law
-Haven't changed oil yet, because it too had been changed prior to my purchasing the car. Level seems a bit high though, tbh. Valvoline synth-blend 5w-20.
-Current tank has Redline SI-1 Fuel System cleaner in it because my sister in law never drove the car more than 5 miles (typically .5 miles each way to work) and she always bought cheap gas. So I'm suspecting that perhaps combustion chamber/injector deposits could be a possibility.
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At 60 mph with cruise you should be getting like 37-38 mpg, flat road, no wind. Other than what I said I can't really think of what's causing your lower readous, unless maybe the O2 sensor is failing. I'm not a mechanic by any means but it seems that if it was an O2 sensor your MPGs would be in the 20s (but don't quote me on that). But your first tank is was almost 34 mpg? What did your Scangauge reading say for the tank before you filled up? It could be pessimistic/not calibrated correctly; honestly that's what I'm down to here.
Your maintenance is good so there shouldn't be a problem there.
Anyone else have thoughts? I confess beyond what I've said I'm somewhat befuzzled. These Civics should get in the thirties without trying.