re: what mpg do you get?
2005 Accord diesel estate, 2.2 turbo diesel 193K miles, mainly sitting on motorways at "quick" speeds I get 46-47 real mpg calculated from brim to brim fill ups
I reckon driven more carefully I could easily get > 50 mpg but its a trade off of how long to get home vs the extra bit of diesel.
if your car has no real faults likely to cost more than a couple of hundred quid for a years running then it will never pay to swap to get a few more mpg.
for other "cars" I've had recently
1997 Volvo V70 T5 estate on LPG, easily hit 24 mpg with LPG at 1/2 petrol cost so equivilant of 48 mpg, driven to ~ 250K miles and still drove lovely
1998 Audi A8 4.2 V8 LPG worst 17 ( thus 34ish) best 24(48) , however this threw its gear box and a few other big bills so only lasted 1 year
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