MPG question I KNOW I KNOW
Grand Champion
Joined: Aug 2009
Posts: 5,971
Likes: 45
From: MAINE
Well I did a tune up less than 6K ago, cat back exhaust, brand new 265/70/17 tires I did go down a size from 275 but that's just width. I've never changed the O2 sensor since I've only put 9K on the truck since I bought it almost 2 years ago. It has new brakes, rotors, I do know it needs new tie rods but other than that the truck is in great shape just bad gas mileage. I drive 1.2 miles to work each day but I do drive about 60 miles once every other week and once in a while a road trip. But the gas just sucks. The plenum gasket is ok I believe I looked down the TB and did not see any oil.
looks can be decieving i thougt my plenum was good because i always looked through the TB and never saw pooling. when i took the TB off, thats when i foundthe il. So try taking the TB off all together, and you will get a uch better view.
All Star
Joined: Sep 2009
Posts: 855
Likes: 0
From: Alabama
Plenum gasket may be blown
im currently getting 13-14 city, and around 17 highway... that is no joke. i also have take very well care of my truck, and im basically replacing everything with new parts. 65% of the parts on the truck have been replaced in the last 30K. i also ont hammer on it that much, and i hardly do any 4 wheeling.
and i have 4.10's and tach about 1900 at 70 mph
Takes time, effort, lots of new parts, and lots of money to get them going good, but its worth it.
im currently getting 13-14 city, and around 17 highway... that is no joke. i also have take very well care of my truck, and im basically replacing everything with new parts. 65% of the parts on the truck have been replaced in the last 30K. i also ont hammer on it that much, and i hardly do any 4 wheeling.
and i have 4.10's and tach about 1900 at 70 mph
Takes time, effort, lots of new parts, and lots of money to get them going good, but its worth it.
265/75 16 tire / .69 final gear / 4.10 drive gear this is what you have, correct?
1900 RPMs would barely be 63 mph
3.92 at 1900 RPMS with the same tires... 66 mph
3.55 at 1900 RPMs with the same tires... 73 mph
sorry, but i will have to disagree with that... there is no way that is possible.
265/75 16 tire / .69 final gear / 4.10 drive gear this is what you have, correct?
1900 RPMs would barely be 63 mph
3.92 at 1900 RPMS with the same tires... 66 mph
3.55 at 1900 RPMs with the same tires... 73 mph
265/75 16 tire / .69 final gear / 4.10 drive gear this is what you have, correct?
1900 RPMs would barely be 63 mph
3.92 at 1900 RPMS with the same tires... 66 mph
3.55 at 1900 RPMs with the same tires... 73 mph
thats what i thought. thank you. though i turn about 2000 at 70 with 295/70 and 3.55 in TC lock up.
Champion
Joined: Aug 2009
Posts: 3,015
Likes: 8
From: Western NY,
btw I have 4.56 gears and 35" tires and I'm at about 2100 rpm's at 70 mph (stock should be here too btw) If I had stock gears it would be at like 1700 and the engine would be ******* and struggling to stay in OD.
Last edited by Augiedoggy; Nov 18, 2009 at 08:05 PM.
Champion
Joined: Aug 2009
Posts: 3,015
Likes: 8
From: Western NY,
this is why if you get the correct gears to match the tire size the speedometer will read correctly again without reprogramming anything.
Last edited by Augiedoggy; Nov 18, 2009 at 08:07 PM.
what do you mean tach. at all speeds?
the tach reads the rpms of the engine, and has nothing to do with tire size/gear ratio.
