I just bought a 1995 Jeep Grand Cherokee Limited with a 5.2L V8. I am get good gas mileage at 21mpg combined highway and some city. I have put in a K&N air filter and opened up the air box. I want to either change the configuration of the air cleaner assembly that sits on top of the throttle body because it is very restrictive and make a very sharp turn down into the throttle body or put in a throttle body spacer. I don't have much room under the hood which is probably the reason for the inlet configuration. The throttle body spacer will cost me around $90. The air cleaner inlet extension will cost a few dollars since I will make it myself. I will be driving the Jeep between 60 and 80 miles a day. Does anyone know if the spacer will increase mileage or just performance?

I've been away for awhile and its good to be back. I look forward to all the good info I have received in the past.

Just for everyones information the spacer at the air cleaner that I thought was going to improve the air flow in to the throttle body actually must have made it worse. It reduced my gas mileage by 2 mpg.

I am having a little ping under heavy load. Does anyone know how to tune a Jeep V8 for regular gas so it does not ping?

the main reason for a spacer in your application would be to reduce the temp of the incomming air, whitch will proboly make for a cooler, denser intake charge....or more power and mileage..., you could in fact make a spacer out of plywood and get the same effect...wood is a good heat insulator..and Im sure the cost of some (very clean) but scrap plywood wouldnt be so expensive either...



p.s just make sure you dont get any wood down in the motor...