anyways i got a 1990 crx si which i swapped a jdm doch zc engine in a year or so ago. i never really looked at my mpg before or after until now that i came across this site. anyways i calculated my mpg from a long 300+ km highway trip and came up with 22mpg which really sux cuz i got 420km total on the tank of 45 liters. i was reading briefly on this site, would changing my
o2 sensor increase my mpg? cuz its possible that its the original sensor ( the previous owner did very minimal maitnance to the vechile). also any other tips on increasing my mpg?
Yeah, cold and wind can definitely be giving you those low numbers. I still wouldn't hesitate to go over the car with a fine comb though. Check out the forums about increasing fuel efficiency and make sure stuff is up to snuff. He hehe, it rhymes!
I would say that it's your oversized ZC engine that is giving you a bit of the low MPG, I know a number of people who have or used to have the crx SI, and they alwas got close to 40mpg with it with the stock engine, but you did a swap.
If you put in a "full flow" exaust, you are most likely hurting your mileage, and power, same thing with the short air intake, as they have a tendency to de-tune your engine so it has a very narrow range that it runs efficently at.
Welcome to Gassavers. I don't know how much of what is affecting your mileage, but it sounds to me like it is enormously low, for that car, even with an engine swap. I'd definitely do an O2 replacement, new spark plugs and so forth. Additionally, if you did go with a full flow exhaust, you should consider switching it back to stock. For some reason those full flow exhausts seem to really kill the mileage.