What's going on with my mileage?
#1
Senior Member
Posts like a Camaro
Thread Starter
What'* going on with my mileage?
I'm very puzzled.
My mileage has dropped 2-3 MPG even though my driving habits haven't changed.
It was time for plugs and wires, so I went with Beldens and NGKs. I checked engine vacuum, normal, and did a compression test, all cylinders right around 155. Oxygen sensor about 10K ago (Delco) which resulted in no change in mileage.
Any ideas, guys, besides a midnight stakeout of the vehicle with my 12-gauge?
My mileage has dropped 2-3 MPG even though my driving habits haven't changed.
It was time for plugs and wires, so I went with Beldens and NGKs. I checked engine vacuum, normal, and did a compression test, all cylinders right around 155. Oxygen sensor about 10K ago (Delco) which resulted in no change in mileage.
Any ideas, guys, besides a midnight stakeout of the vehicle with my 12-gauge?
#2
DINOSAURUS BOOSTUS
Expert Gearhead
Do your fuel blends get changed around this time of year like they do in my area?
Changes in the fuel blend can seriously effect MPG.
Take for example a trip I took to NY a year ago. Way there..mileage was great. Way back...mileage sucked and I drove slower and better..mileage wise.
NY Gas is known to contain mileage and power robbing ingredients .lol
Changes in the fuel blend can seriously effect MPG.
Take for example a trip I took to NY a year ago. Way there..mileage was great. Way back...mileage sucked and I drove slower and better..mileage wise.
NY Gas is known to contain mileage and power robbing ingredients .lol
#3
Senior Member
Posts like a Camaro
Thread Starter
California has oxygenated gas (10% alcohol) year-round, but the car has always gotten 20 MPG with little difference between highway and city driving since it was new.
Guess that makes sense, though, I'll check it out.
Guess that makes sense, though, I'll check it out.
#4
Retired
Air filter, tire pressure, lack of wax can be factors.
__________________
Retired Administrator
2002 *-10 5.7 V8
2023 Jeep Rubicon Diesel
Retired Administrator
2002 *-10 5.7 V8
2023 Jeep Rubicon Diesel
#8
Junior Member
Posts like a Ricer Type-R
Right. Which explains why military aircraft are commonly painted non-gloss, and why nobody that runs at the salt flats waxes for speed?
Ok, we had our fun. Back on topic. :lol;
Ok, we had our fun. Back on topic. :lol;
#10
wow that would make since! My plugs and wires were totaly bad so I thought that was my MPG problem. I changed them and it went from 20 up to 22 mpg but that is 3 mpg lower then I got all summer. and yes I just started noticing the problem with the colder weather in september and the damp dew in the morning is how I found out my plugs wires were bad.
wInter blend gas has MPG robbing chemicals in it?
wInter blend gas has MPG robbing chemicals in it?
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