I bought a 09 civic 1.8 engine, owner bought a porsche he said he always changed the oil 10k and only highway miles. 104k miles on it right now. The problem is I drove around 100 something miles and when I calculated I got around 25mpg highway only. I usually drive on the passing lane and people go around 80-90mpg. I do the mpg for heavy city driving and I get around 21.5mpg. I checked the google and I am supposed to get like 33mpg for city? I am confused. I always use the same pump I fill it max then reset the trip tracker I fill it up then divide the miles driven by the amount of gas I filled to max. I am pretty sure my calculation is correct. I don't slam on the gas all the time I definitely don't drive like a grandma but I am never really the fastest car on the road I just follow the cars in front of me. One example I recorded was 63 miles and I filled 2.91gal.

Also not sure if it is related but this car has a lot of engine braking when I let go off gas compared to my 05 chevy where there was literally zero engine braking when I let go of gas. It is like this car doesn't like it when you let go off the gas pedal, lol.

 

Youre driving 80-90 mph and surprised the fuel economy isnt as good as the EPA numbers? lmao

 

I know you are a funny guy but let me tell you my old car was pretty close to EPA with the same speeds. I didn't know hondas were this **** on high speeds my bad.

 

EPA estimate for city is 26, not 33. Just because you're not the "fastest car on the road" doesn't mean you're immune to the law of physics.