Spark plugs are brand new OEM spec Denso replacements, gapped proper and torqued.. or do you mean pull them and see how they look after driving?
MPG of a V8.. I know...
- Thread starter ElDuck
- Start date
Spark plugs are brand new OEM spec Denso replacements, gapped proper and torqued.. or do you mean pull them and see how they look after driving?
Same. I rarely crack 110 km/h. Funny, I get better mileage going to Edmonton than I do coming back. I think it's the extra 400 meters of elevation in Calgary.
On the highway to BC, I've gotten as good as 11.4 liters/100 km (20.45 mpg). I have gotten about 575 km out of a tank of fuel (~360 miles). That is summer gas and not winter gas, though.
I've also wondered that. No codes, though.
montijo505
Senior Member
LOL, I have never heard anyone say they get decent mileage at 75-80 in a T4R. . . . . that's actually impossible. My '04 with 235k gets 16-17 city and 19-20 highway when I keep it around 65. Going 70 drops it about 1 mpg. This is all hand calculated also.
Caldizzle
New member
Hmmmm, something is definitely amiss...I get at least 17mpg highway with my mods, and regularly around 18mpg on roadtrips. Do you have any symptoms of a wheel bearing going? I had to replace my passenger side and my MPG went up about 1.5mpg after that...
Something else to note is that it is winter now, so fuel is most likely winter blend. I ALWAYS get worse MPG with winter blend fuel, but nothing as substantial as 14mpg highway.
I would start by bumping your tire pressure up to 36 and see what you get.
Something else to note is that it is winter now, so fuel is most likely winter blend. I ALWAYS get worse MPG with winter blend fuel, but nothing as substantial as 14mpg highway.
I would start by bumping your tire pressure up to 36 and see what you get.
I've had my V8 '06 limited for about a month now. PO said his heavy-footed wife got 14 mpg around town and he got 19 driving it down from colorodo to TX for thanksgiving. In the month i've had it i avg 19, with avg speed between 20-22. I have been very easy on the pedal since i've had it. I haven't even gunned it yet. I can live with this...i was terrified i's be getting 14 around town with this thing.
I coast in to red lights, stop signs, etc. Drive it like i'm driving a bus and that seems to help with mileage.
I coast in to red lights, stop signs, etc. Drive it like i'm driving a bus and that seems to help with mileage.
AuSeeker
Elite Member
Is the MPG your getting coming from the computer readout on the dash or are you manually calculating the mileage?
That being asked your driving style is the way to go to get the best MPG from a V8 T4R.
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Dirtrider216
New member
My build specs are current and my trip computer shows 16.5 mpg with cruise control set at a gps speed of 70 over a 200 mile trip
I use the most expensive Mobil 1 full synthetic oil every 3-5k miles and a fuel system cleaner every oil change
I get about 11 mpg for long term city driving with no highway
I use the most expensive Mobil 1 full synthetic oil every 3-5k miles and a fuel system cleaner every oil change
I get about 11 mpg for long term city driving with no highway
Heck yeah!
that's from the car's ecu reading. I have had to disconnect the battery a couple times so i haven't been able to calculate the true MPG with a fill up/miles driven calculation yet. Guess i need to write down the ODO mileage at next fill up and use that instead of resetting the trip ODO, which gets reset on battery disconnects.
AuSeeker
Elite Member
Just so you're not surprised, the readout is usually 1 to 2 MPG more than the actual MPG you're getting.
doofenshmirtz
New member
I’ve been pretty watchful on this as well, my actual mileage is almost exactly 10.5% less than the computer every time.
Technically, I might be doing better than that because I supposedly have +1 size tires. (265/70/17 instead of 265/70/16) However, my measured tire diameter is what factory tires should be. Because of that, I don’t give myself the extra 3% in my hand calc.
yeah, so i've heard.
codeman528
Member
I say give your engine a little love to give it the best chance for gas mileage; clean fuel injectors and the valve train (both of which can be done with SeaFoam, Im a fan). New spark plugs might not be a bad idea either, even if for a general maintenance item.
I would also recommend lowering your speed to around 65 if you can stand it.
Lastly try bumping up your tire pressure a few psi, maybe to 37?
I would also recommend lowering your speed to around 65 if you can stand it.
Lastly try bumping up your tire pressure a few psi, maybe to 37?
All my new to me vehicles get the Seafoam love. Plugs are new OEM, and gapped proper.
The speed lowering won't happen. I-94 is basically Michigan's NASCAR speedway. 75 is the bare minimum otherwise you're fighting traffic or sitting behind a semi. 77/78 is about the average sitting in the median running radar.
I was gonna do a chalk test on the tires to see which PSI they like.
Update!
UPDATE: Alright, so I originally pulled the pins and lubed them up. Pins came out and moved freely. What I did not do was check the pistons on the front caliper. Both had one piston froze up. Went to my local part slingers and got some A1 Cardone remans with a 2yr warranty at employee pricing and I will install them tomorrow. Hopefully this fixes, or well, improves the mileage I'm getting.
Appreciate y'all that recommended the calipers, and while it was my first thought and first check, I was not as thorough as I should've been.
UPDATE: Alright, so I originally pulled the pins and lubed them up. Pins came out and moved freely. What I did not do was check the pistons on the front caliper. Both had one piston froze up. Went to my local part slingers and got some A1 Cardone remans with a 2yr warranty at employee pricing and I will install them tomorrow. Hopefully this fixes, or well, improves the mileage I'm getting.
Appreciate y'all that recommended the calipers, and while it was my first thought and first check, I was not as thorough as I should've been.
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