The idea of doing an engine swap is a hell of a lot of work though. Beyond that it would probably cost a lot more in time and parts then it would go pick up a compact clunker car that you can use for commuting. Besides that I'm not sure I'd want a 4 banger in my Blazer. It's a awfully big vehicle to be pulled around by a 4cyl.
It still comes down to the fact you're using a Blazer for a very large commute each day. You will never see a decent amount of gas mileage out of it, so if it's really that big of an issue I raise the question again, why are you using a Blazer as a DD for commuting?

 

that's what the Brazilians get for their "diesel engine option". i've been trying to get one of those up here for awhile now.......

 

ideally with tons of free time and free $, i would too....

as for a 4 banger either get a 2.2l (or is it 2.0?) out of a chevy tracker, or just get yourself a $2,700 Silver '02 2 dr convertable ZR2 Tracker....
hell, get it as a manual and enjoy your 4x4 with 23mpg rating

 

that so just ruined the ZR2 name.

 

if that doesn't scream ZR2, I dont know what does!

 

Well that'll be a little tough because they don't have an SiR down here. Just a 197hp Si. It's also in manual only.

 

*Shakes head* A buddy of mine tried to convince me to get one of those instead of the Blazer because "they look like a mini Bronco."

 

it looks like a mini coffin if you were involved in a collision at more than 15 mph

 

yeah, i just found out that it's the same car. for some rason we get an extra (capital) letter added to our version.

isn't that special!