Just got van back from warranty service on transaxle and told service writer in 20 degree weather it took 9 miles to warm up to get decient heat. he said his tech said there was no problem (obvius in 70 degree weather) and I have never gotten over 18-19 MPG (15 MPG in winter) Thermostat? They would not replace it. (still covered under 3-36000 warranty).
MAF sensor? IAT sensor? ECT sensor?
Any common problems with 4.2 V-6?
PCM just had a update flash