Are there any carb vs. fuel injection experts out there? I am curious why two cars of same size and weight, with the same engine and transmission, except one is older and has a carburetor, the other has fuel injection... both cars run fine... why would the carbureted one get significantly worse gas mileage at interstate speeds (65-70 mph)? In this case we are talking about two front wheel drive GM A body vehicles (which are obviously not new cars at this point) with 2.5 4 cyl engines and auto trans... Both are in a good state of tune... why would both cars get about 25 mpg city... but on the highway on a long trip, going 65-70, would the one with fuel injection, get 32 mpg, while the one with a carburetor get only 27 mpg?
I don't think it is an ignition issue as both run great. It isn't a tire pressure issue since both have equal tire pressure. Any thoughts appreciated. I plan to keep both cars but think the older, carbureted one could do better on gas (who wants to spend extra money on gas these days...)