19.6mpg (us gallon) is really bad. I get 25mpg worse case, slow driving.
unless driving dead slow in snow. (sand dunes?)
You get same MPG as my 4600lb. chev truck ! sold it.
other wise bad.
2wd or 4wd?, if 4wd are your hubs unlocking? (autos bad, or manuals set wrong)
is the check engine lamp on key on, then goes out after starting?
if the problem is in the engine /EFI and not because of right foot,
it can be any of the following:
1: high fuel pressure, do to bad Fuel pressure regulator.
2: engine not reaching 180 (82C) to 200 deg. F.
3: ECT is bad and does not show coolant at 180 but 140 , and stays rich all the time)
4: IAT bad, same reason as 3, but this time AIR.
5: bad map sensor ( rare as hens teeth)
6: ECU bad, put in a fresh set of capacitors , per my link (SIG)
7: Bad Oxy sensor. (car will run rich with it bad ,usually)
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