So I have a 95 Ranger (actually a B2300 but y'all ain't new to that paradigm). 2wd, Automatic. My fuel economy stinks. I'm only getting 12-15 HWY. We've recorded a couple of tanks that got 22 combined, and then then A/C cut out. It dropped after A/C was remedied (recharged because refrigerant leak was too small to justify fixing the leak. We thought that was part of it, but even when the A/C is turned off, the mpg is still 14 or less.


Here's the mundane

I got this truck from a friend who got it from a cousin that modded it. It's as redneck as dining barefoot an' usin' a Confederate flag as an emotional support blanket. Custom camo, a tiny custom bed that makes it as aerodynamic as a cutaway. 16 inch mustang wheels (yes, my mpg numbers account for the bigger than stock wheels).

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Here's the crucial

I was told by a mechanic to check the MAF. Power and signal check out.

The EGR is bypassed and has a bolt to plug the vacuum line but doesn't have the port blocked. Not done by me. The cat was cut and straight piped by previous owner, but both O2 sensors are there. They left the muffler at least.....

Code scanner shows P0141 and P0401, which correspond with

​​02 Sensor Heater Circuit Bank 1 Sensor 2 and Exhaust Gas Recirculation Flow Insufficient Detected respectively.

I don't know if the heater circuit code is a possible response for high exhaust heat or just a faulty sensor. Would love some insight before my next planned step of replacing the cat and downstream O2. Engine other wise seems to run smooth. I have very little power, but I assume that's in part to blame the mustang wheels for, but again, I don't. Thanks in advance, guys

 

The bigger tires are making your engine work harder, which makes it use more fuel.

 

I wondered about that. How likely you think that alone is responsible for cutting the fuel economy nearly in half? Should I skip reinstalling the cat and replacing the O2 sensors and just change to stock wheels?