no need to convert they made them for a few years 
this one is a CNG Bi-Fuel meaning it runs on gas or CNG theres also a LPG Bi-Fuel
and a dedicated CNG model. the dedicated ones with the extra tank where the gas tank go near 300 miles at the mixed EPA numbers
Compare Old and New MPG Estimates
EDIT
there all auto trans and 5.4L engine
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1 86 T\D trooper with rare GEN 3 rods TRANS FIXED  NOW DD
1 86 4WD 5sp pup is 2.3L gas, but plan on 2.2L diesel repower
1 91 trop, long term plan is a group buy of imported Isuzu 4JB1-T 2.8L I-4 engines, hoping to get price down to 2K not 3K plus
1993 sidekick my MPG toy, epa rating 26.
i get 29/31 with stock drive train.
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