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somthin ive heard of for helpin with gas milage is a hydrogen generator im not exactly sure how it works but i got a buddy buildin a small one its supposed to get 10% better gas milage supposedly there is a more complicated version that gets you 75% better but hes starting small first i may do...

i havnt actualy heard of the 3.8 was it an amc?the 4.0 has more hp and torque than the 4.2 but it makes the most torque at maybe im wrong but i think its like 2400 to 2600 rpms its also fuel injected the 4.2 had a carb so there is part of the difference in gas milage they both share the same...

my jeep has a 4.2 inline six i put it in there but yea i get about 13 mpgs my jeeps a 89 wrangler i love it robs right it makes great torque i think the peak is like 1600 rpms its great for rock crawlin you just gotta gear it i just wont be able to drive it during college itll eat me alive on...

well i aint been on here in forever i got a jeep for my first project instead of a duster(dad knew id do donuts either way n he ratherd i do em in the mud lol) and well its awesome but i need better n 13 mpgs i wont be able to drive it thru college i hear a /six is good for 30 mpgs but i worry...