3 ms·

Not the OP, but... My car is 10 years old - 170k miles on it - I still get > 25mpg, and I calculate every fill-up. Long trips I get ~30mpg. Around town it's

Not the OP, but... My car is 10 years old - 170k miles on it - I still get > 25mpg, and I calculate every fill-up. Long trips I get ~30mpg. Around town it's 26-28, depending on how much I use the AC and at what times I'm driving. Could I be off in my fill-up estimations? Possibly some now and then, but it's been pretty consistent for the last several years.

VLM 12y ago
I've been driving for awhile, and as I think back on all the mileage related mechanical problems my 87 horizon had that would cause an insta ODB-II fail on my 14 toyota, I'm thinking OP is older-ish like me. My '87 was one of the last models with a carb (or am I thinking of the '81 ?) and it had a mechanical choke that would get stuck on a regular basis in the winter and the thermostat also broke / got confused. I think most of the time I was driving around with what on a modern car would be at least 2 or 3 engine code violations. It was reliable as in it always got me to work, but it was not economic or efficient and was usually broken at one level or another. Modern cars are just more reliable and self diagnose very effectively.