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he issue is pretty much across the board, possibly with the exception of Jeep, but I haven't been in a new Jeep. My 93 Grand Cherokee did not suffer from this problem, but that's no spring chicken these days.
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WOOO JEEP!!!!!! lol, I know, it's funny how my 13 year old vehicle has more gauges and info about how the vehicles running than a new 07 or 08 vehicle. And mine actually moves, I can actually tell when the thermostat opens cause it drops about 10-20 degrees from the rush of cold coolant.
And I have a volt meter, so I can look at the load on the engine, the lower the volts, the more load. it usually drops when the a/c compressor kicks on.
Oil pressure gauge helps a lot too. hotter the oil, the lower the pressure. It moves around the most, ranging from about 35psi, to about 70. sometimes down near 20's, but while coasting, pressure is lower, when I'm back on the gas, the pressure shoots up a little again.
what's even better is my grandpa's 1968-74 RV has even more gauges than mine! it's about 40 years old and has vacuum gauge instrumentation, with green and red areas that say good mpg's, poor, idle, and decelerate. Why can't modern cars have more on board info!?