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my frontier is a 1998, 4 cyl, 5 sp, 4x4: mods (maintainance) include: tune up (new plugs, air/fuel filters, injector service) i try to shift at 2500-3000 rpms usually. i also only use 93 octane gas. here in ct, they use winter gas from october thru april that is supposed to burn cleaner, but also reduces gas milage by about 15-20%. i was getting about 14-16 miles city with the winter gas, now i'm getting 18-20 with regular gas. i thought that was kind of low milage. any thoughts??
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