Re: MPGs are taking a dump
Originally Posted by NHWK05
I've never ever seen 20 mpgs highway with my 05 wk! I get 13.5 city an 15 to 18 at best highway ac on taking it easy...... Its got to be something like a sensor or pcm or similar I'd think.
Mine does about 15-16 in town and 18-19 hwy (70mph). AC drop is 1.5-2 mpg in town and 1 mpg on hwy. BTW: 89 octane and no special tune. Load runs 40-50% and spark advance is 15-30 degrees depending on whether MDS is active. EGR valve is 65% when open and generally closed on MDS and at zero throttle.
The Heep does a startup rationality check of the IAT, ambient air temp., and coolant temp (if cold). Anything out of general agreement will generate a DTC. If you can monitor IAT and MAP, it will help rule out these items.
'08 WK Limited, 5.7L HEMI, Quadra-Trac II, Bright Silver Metallic, Class IV Hitch, Michelin LTX M/S tires, Billet Technology oil catch can, Fumoto oil drain valve.