I avg 10 - 11 98% city Kinda heavy foot
I avg 10 - 11 98% city Kinda heavy foot
PJMJR508
(Happy Jeep)
I get 12-13 with a relatively light foot for my city driving. Sometimes I'll see mid to high 13s when cruising 50-60 mph on some back roads.
I don't see 10 unless im towing or offroading...
My friend Bob who just got the 06 HEMI XK a few weeks ago called me last night. A few days ago he swapped out the spark plugs with oem champions purchased from the dealer. He said that the plugs he pulled out were the same part number as the ones he put in and that they looked like they were original from the factory. His XK has 72,000 miles and the plugs that came out were shot with a gap of .060+. The new plugs were gapped according to the sticker under the hood and he said his Hemi runs so much stronger now but at the same time his MPG has dropped down significantly. The only change was the new plugs.
Now im not an expert on this but is it possible that the engine learned the gap of the old plugs and is now dumping more fuel to make up for the new plugs and better spark? Maybe the PCM just needs to relearn everything now with the new plugs.
2007 4.7 Liter XK | Front Modified OME HD Lift | Rear 4" Superlift | JBA UCA's | Rusty's Rear Adjustable Track Bar | Rysty’s Adjustable Upper and Lower Rear Control Arms w/Heim Joints | Mickey Thompson Classic III 17x9 Wheels | 315/70R17 Goodyear Duratracs | Airflow Snorkel | Flowmaster 40 Series Muffler | Superchips Flashpaq | Mopar Skids | 4xGuard Belly Guard | American Rebel Rear Diff Cover | Rear Powertrax No-Slip | Front Electronic Locker | Rear Heat/AC Delete
Not sure, but I was talking with my Dad this weekend about our computers and what not.. Although they need to "relearn" at times, they are sensitive to the driver itself. For instance, when I accelerate even if not WOT it will accelerate almost like WOT per my driving habits its learned. Its possible it reads a better spark and cause of his driving habits its dumping more fuel in to accommodate the better spark, but Im trying to figure out why mine as dropped with no change to the XK at all. Im guessing just how heavy my foot is but Ive been nursing her around and my mpg is going down! Maybe a good question is what fuel type are people using and which gas station?? I wish there was a race trac around here I always got waaay better mpg with their fuel..
2K6 Limited Jeep Green Metallic/Saddle Brown Leather XK HEMI QDII Old Man Emu HD Suspension w/ Fox Emulsion 2.0 Rear Shocks 1.5" SpiderTraxx Wheel Spacers 265/70 GoodYear MTRs w/Kevlar True Dual Exhuast w/IMCO 50 K&N 63 CAI Diablo 91/Performance Transmission Tuned SA Belly Skid MOPAR Gas Tank Skid, Transfer Case Skid, Suspension Skid Front Tow Hooks 6k HID Lows/3k Fogs
What octane are you using? I wouldnt go over 91. Thats what I run and have flashpaq tuned to 91 performance. Bob uses the same octane on same tune.
Last edited by 07JeepXK; 07-24-2012 at 06:49 AM.
2007 4.7 Liter XK | Front Modified OME HD Lift | Rear 4" Superlift | JBA UCA's | Rusty's Rear Adjustable Track Bar | Rysty’s Adjustable Upper and Lower Rear Control Arms w/Heim Joints | Mickey Thompson Classic III 17x9 Wheels | 315/70R17 Goodyear Duratracs | Airflow Snorkel | Flowmaster 40 Series Muffler | Superchips Flashpaq | Mopar Skids | 4xGuard Belly Guard | American Rebel Rear Diff Cover | Rear Powertrax No-Slip | Front Electronic Locker | Rear Heat/AC Delete
I dont have a tune and Ive been doing 87 or 89 and saw real no difference. Next fill up I will do 91, best mpg came from Sunoco which is what Im running now 87 so I will go up to 91 or 93.
2K6 Limited Jeep Green Metallic/Saddle Brown Leather XK HEMI QDII Old Man Emu HD Suspension w/ Fox Emulsion 2.0 Rear Shocks 1.5" SpiderTraxx Wheel Spacers 265/70 GoodYear MTRs w/Kevlar True Dual Exhuast w/IMCO 50 K&N 63 CAI Diablo 91/Performance Transmission Tuned SA Belly Skid MOPAR Gas Tank Skid, Transfer Case Skid, Suspension Skid Front Tow Hooks 6k HID Lows/3k Fogs
I thought that its recommended to run a minimum of 89 octane in the Hemi's??
2007 4.7 Liter XK | Front Modified OME HD Lift | Rear 4" Superlift | JBA UCA's | Rusty's Rear Adjustable Track Bar | Rysty’s Adjustable Upper and Lower Rear Control Arms w/Heim Joints | Mickey Thompson Classic III 17x9 Wheels | 315/70R17 Goodyear Duratracs | Airflow Snorkel | Flowmaster 40 Series Muffler | Superchips Flashpaq | Mopar Skids | 4xGuard Belly Guard | American Rebel Rear Diff Cover | Rear Powertrax No-Slip | Front Electronic Locker | Rear Heat/AC Delete
There are currently 1 users browsing this thread. (0 members and 1 guests)