[M_a_t_t]

Originally Posted by racprops

A 1995/2005 Ford/Chevy full size Van.

Or any car,

I remember all that was only worth around a gain of 5MPG.

I got 18 city and ~21.5 highway on my 95 Astro (with the v6 still). My only mods were wheel discs, partial grille block, and an e-fan swap. EPA 14 city 15 mixed and 17 highway. Although I've gotten 20 on 2 fillups with the carb'd v8. I think mostly because of the 'manu-matic' setup I have going on it. (If you look at my fuel log and question the 7 and 8 mpg gallon fills I had almost exclusively been pulling a car trailer around the yard).

For my car (4 cyl auto), my best was 45 MPG consistently (on 55mph roads). Boat tail, grill block, airdam, front belly pan (just engine bay), mirror deletes, weight reduction. I think that's it. Now I've got motorcycle mirrors, grille block, separation edges and weight reduction. I get 33-36 depending on time of year. I didn't test any of the first mods so I don't actually know what was working and what wasn't so interpret that how you want. But almost 10 mpg isn't bad. It's really about how many miles you drive if it's worth it.

My eco-techniques are basic since both are automatics. Just don't rush to a stop light and minimize brake usage when in traffic (keep space, engine brake, etc.)